---
title: "Bay Window Cushion Set in Navy Floral, Cut in Three Pieces"
url: "https://cushionguide.com/readings/three-piece-navy-floral-bay-window-cushion-set/"
section: "Readings"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-08-23"
updated: "2026-09-24"
keywords: "bay window cushion, bay window seat cushion, window seat cushion, trapezoid bench cushion, angled window seat cushion, custom window seat cushion"
---

# A navy floral bay window seat cushion in three pieces, and what it borrows from the patio

*Nate answers three questions about thickness, sizes and fabric codes, then reads a three-sided bay the way a boat berth gets read: as honest pieces, not one big guess.*

> **The quick answer:** A three-sided bay window cushion works best as three pieces: a center rectangle and two end pieces cut to each wall's angle, with the joins under the mullions. Borrow two habits from outdoor cushions, lift-out pieces and a paper template for odd shapes, and leave the stiff outdoor fabric outside. Standard thickness is 4 in (10 cm); other thicknesses are made on request.

![Three-piece bay window seat cushions in navy floral print with pale blue and ivory pillows, waffle throw and linen blinds](https://cushionguide.com/media/bay-window-cushions/three-piece-navy-floral-bay-window-cushion-set-1600.webp "A bay window seat split into three cushions, each cut to its own wall, in one navy floral with self piping.")

## Three bay-window questions

**A common question:** How thick are your cushions, and can I pick something other than the standard?

**The workshop's answer:** The standard is 4 in (10 cm), but any thickness can be made. Buyers have gone thinner, at 3 in (7.5 cm) and even 2 in (5 cm), and thicker, at 6, 8 and 9 in (15, 20 and 23 cm). Thicker cushions cost more. Write the thickness you want in the order note.

**A common question:** My window seat falls between two sizes in the drop-down. Which one do I click?

**The workshop's answer:** Pick the closest option, usually the one just above yours, then type your exact dimensions and fabric code in the note. A 16 x 56 in seat went through the 16 x 55 in option, and a 17 x 36 x 4 in one through 18 x 36 in. The workshop sews to the note, not to the option.

**A common question:** Which fabric code is the cushion in your listing photo?

**The workshop's answer:** Ask, and the workshop will name it from the photo; one window bench, for example, is L-54 with L-52 piping. Sunlight and camera angle can shift a tone slightly on screen, but it is the same fabric.

## The bay that refused to be symmetrical

A buyer in the US wrote to the workshop about a bay window seat that was neither rectangular nor symmetrical. They sent photos and offered to cut a paper template to the exact outline.

Good instinct. The workshop asked for a paper sketch with every side measured, then came back for a few extra dimensions before it would quote. Here is why. When the sides of a bay don't mirror each other, one missing length lets the outline close two different ways, and only one of them is your window.

A full-size paper template settles that on the floor instead of in an email. It is a habit borrowed from boat work, where hardly a berth has a square corner. The [paper template Pattern](https://cushionguide.com/guides/paper-template-for-custom-cushion/) shows how to make one, and the [bay window calculator](https://cushionguide.com/studio/bay-window-calculator/) checks the angles before you commit.

## Pinned by Nate: a bay in three pieces

Five pins, from the center rectangle to the white tulips on the sill.

1. **Center cushion**: A straight rectangle for the middle window, with joins falling at the mullions.
2. **Angled end piece**: Each side piece is cut to its own wall angle so no bench top shows.
3. **Waffle throw**: Folded over the right piece to soften the corner join.
4. **Pale blue pillow**: Matched to the wall paint so the navy print stays the only busy element.
5. **Tulips on the sill**: White tulips repeat the pale flowers in the print.

## Where the seams land, and why the print is navy

Start with proportion. The center cushion is a plain rectangle filling the middle window. Each end piece is a trapezoid cut to its own wall angle, so no bench top shows at the sides. The joins land under the window mullions, where the eye already expects a vertical line. Put a seam in the middle of a pane and it reads as a mistake. Put it under a mullion and it reads as a plan.

Self piping runs around all three pieces. On a busy floral, contrast piping would draw six extra corners across the seat. Self piping lets three cushions read as one seat that happens to lift out in thirds.

The navy floral is the darkest thing in the frame, on purpose. Cool spring daylight through linen roman blinds would wash out a pale print. Navy holds its ground against pale blue walls and the white paneled base, and the oak floorboards add the only warm note, far enough below not to argue.

Every prop has a job. Two pale blue pillows match the wall paint. Two ivory pillows match the blinds. Neither carries a pattern, so the floral stays the only busy element. The cream waffle-knit throw is folded over the right-hand join, softening the one spot where two cushions meet at an angle. White tulips on the sill repeat the pale flowers in the print.

The idea to copy: ask for separate pieces with the same piping. More three-sided seats live among our [bay window cushions](https://cushionguide.com/cushions/bay-window-cushions/), and the [3-sided bay Pattern](https://cushionguide.com/guides/bay-window-seat-cushion-3-sided/) walks through the measuring. How many sides does your bay have, partner?

## What to borrow from the patio, and what to leave out there

| Outdoor habit | In a living-room bay | Borrow it? |
|---|---|---|
| Seats made in lift-out pieces | Three pieces split under the mullions, each out for cleaning on its own | Yes |
| Paper templates for odd shapes | An asymmetric bay closes correctly on the first cut | Yes |
| Counting sun hours | A bay seat sits in direct sun for much of the day; check fading before a dark print | Yes |
| Stiff, water-repellent weave | No rain to shed indoors; a softer upholstery fabric sits better | Leave it outside |
| Dry-fast open-cell foam | Built to drain water; an indoor bay has none to drain | Leave it outside |

## On the cutting table: the three-piece bay

|   |   |
|---|---|
| Cushion | Three-piece bay window seat set |
| Pieces | Center rectangle plus two end trapezoids, each cut to its own wall angle |
| Joins | Under the window mullions |
| Fabric | Navy floral print on an ivory ground |
| Piping | Self piping on every piece |
| Edge | Box edge |
| Thickness | Standard 4 in (10 cm); thinner or thicker on request |
| Pillows | Two pale blue, two ivory, all plain |
| Best for | Three-sided living-room bays, symmetrical or not |

> A bay window seat cut in three pieces looks planned when the joins fall under the window mullions, where the eye already expects a line.
>
> — Nate

> **Tailor's margin:** For an asymmetric bay window seat, tape paper to the seat top, trace it and write every side length on it; one missing side lets the shape close two ways.

## Questions buyers ask next

### Should a three-sided bay window cushion be one piece or three?

Three, in most bays. A center rectangle and two angled end pieces each follow their own wall, lift out separately for cleaning, and put the joins under the mullions, where a line already belongs.

### Is outdoor fabric worth using on an indoor bay window seat?

Rarely. Outdoor weaves are built to shed rain and dry fast, which an indoor bay never asks of them. Borrow the outdoor habits instead: lift-out pieces and a paper template for odd shapes.

### What do I send the workshop for an asymmetric bay seat?

A sketch with every side measured, plus any extra dimensions the workshop asks for. If the bay is truly irregular, a full-size paper template of the seat top is the surest record of the outline.

### What pillows suit a busy floral window seat?

Plain ones pulled from the room, not the print. Here pale blue pillows match the wall paint and ivory ones match the linen blinds, so the navy floral stays the only pattern in the bay.

## Related at the atelier

- [Bay Window Cushion in Dove Gray, Cut in Three Pieces](https://cushionguide.com/readings/dove-gray-three-piece-bay-window-cushion-townhouse/): A bay window cushion is easiest to make and live with as three pieces: a straight center rectangle and two end sections cut to the bay's angles, so only the ends need angled cutting and each piece…
- [Bay Window Cushion in Three Pieces: Cream and Rust Jacquard](https://cushionguide.com/readings/three-piece-cream-rust-dash-bay-window-cushion/): A cream jacquard with a small woven rust dash is a forgiving choice for a bay window seat cushion: the pattern is part of the weave, so it won’t rub off, and small marks disappear into it.
- [Bay Window Cushion in Navy Stripe: Mistakes the Angle Avoids](https://cushionguide.com/readings/navy-stripe-angled-bay-window-seat-cushion/): To order a bay window cushion with an angled end, send a drawing with every edge labeled, short straight returns included, and both diagonals measured, because old bays are rarely square.
- [Big bays, long seats: where to split a large bay window cushion](https://cushionguide.com/concepts/large-bay-window-cushions/): A large bay window cushion longer than about 7.5 ft (2.3 m) is usually best made in two or more pieces, joined at a bay corner or at the midpoint.
- [My window seat has lift-up lids. Should the cushion be split?](https://cushionguide.com/answers/storage-bench-lift-up-lid-cushion-sections/): Yes: split a storage bench cushion at the lid lines, so each section lifts with its own lid; three lids get three cushions.
- [Bay window seats in Victorian houses, one cushion at a time](https://cushionguide.com/concepts/victorian-bay-window-seat-cushions/): A Victorian bay window seat cushion is a custom trapezoid, cut from a drawing that shows every edge, the straight depth and, in an old house, both diagonals.
- [Measuring a 3-sided bay window seat cushion, panel by panel](https://cushionguide.com/guides/bay-window-seat-cushion-3-sided/)
- [How to measure a trapezoid cushion so the numbers close](https://cushionguide.com/guides/trapezoid-cushion-measurements/)

*± 1/4 in — Nate*

---

Written by Nate Kowalski (https://cushionguide.com/masters/nate/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/readings/three-piece-navy-floral-bay-window-cushion-set/