---
title: "Bay Window Cushion in Olive with Ivory Piping over a Radiator"
url: "https://cushionguide.com/readings/olive-trapezoid-bay-cushion-over-radiator-sitting-room/"
section: "Readings"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-05-04"
updated: "2026-09-24"
keywords: "bay window cushion, bay window seat cushion, trapezoid bench cushion, angled window seat cushion, custom window seat cushion, made to measure cushion"
---

# Olive bay window seat cushion: why the piping is ivory, and what the line does

*Nate takes the olive trapezoid apart the way he'd draw it, one edge at a time, and asks the welt a single question: what are you for?*

> **The quick answer:** Contrast piping is the right call on a bay window cushion when the fabric sits close in tone to the wall behind it. This olive linen-look trapezoid rests against sage paneling, so ivory piping draws edges that would otherwise disappear. Self piping would blur into the green, and no piping would soften the angled corners. Measure every edge, then decide.

![Olive linen-look trapezoid bay window cushion with ivory piping on a ledge over a cast iron radiator, newspaper and mug](https://cushionguide.com/media/bay-window-cushions/olive-trapezoid-bay-cushion-over-radiator-sitting-room-1600.webp "Sage paneling, a leather armchair and a morning newspaper make this olive seat a sitting-room reading ledge.")

## The edge in cross-section: where the ivory line lives

Slice this cushion across (please don't) and you'd find four parts: a top panel, a boxed side strip, a bottom panel, and at each top seam a cord wrapped in ivory fabric. That cord is the piping. On this bay window cushion it has one job, and it does it well.

Olive is a deeper version of the sage paneling behind it. Tone on tone makes the seat look built in, which is the goal, but in soft gray daylight it also blurs the edges. The ivory welt draws a clean line along the front and around each angled corner, so the trapezoid reads from across the room. Angles are just lengths in disguise, and good piping shows you every one of them. The cloth is one of the [linen-look fabrics](https://cushionguide.com/fabrics/linen-look-fabrics/); more seats like it sit among the [bay window cushions](https://cushionguide.com/cushions/bay-window-cushions/).

The props keep the scene honest. A folded newspaper on the cushion and a white mug on the deep sill make this a morning reading ledge, with the sill doubling as a side table. Tan leather armchairs pull in the warm floorboards, and brass catches on the sash windows add a little shine.

Now the part I'd check first: the ledge sits over a cast iron column radiator. The seat stays warm all winter, but warm air still has to rise into the room, so keep the ledge shallow and let the cushion stop at its front edge. What sits under your ledge: a radiator, a vent, or plain paneling?

## Pinned by Nate: five points on the bay

Five pins across the bay, from the ivory welt on the front edge to the radiator underneath.

1. **Folded newspaper**: Sets the scene as a morning reading ledge.
2. **Mug on the sill**: A deep sill doubles as a side table for the seat.
3. **Radiator below**: The seat stays warm in winter; leave room for heat to rise past the ledge.
4. **Leather armchair**: Tan leather ties the olive to the floorboards.
5. **Ivory piping**: Keeps the edge visible against the green paneling.

## Self, contrast or none: three welts on olive

| Piping | Against sage paneling | Verdict on this bay |
|---|---|---|
| Self (olive) | The edge melts into the wall in gray light | Calm, but the angles blur |
| Contrast (ivory) | A clean line on every face and corner | The pick: the shape stays readable |
| None | The softest, most relaxed outline | Corners look rounded from across the room |

## Two 45° corners and faces of 19 7/16 in

A buyer who came to the workshop on a referral had a bench that wrapped around a bay instead of running straight across. They sent a photo and the top measurements: 45° corners, with 19 7/16 in (49.4 cm) between corner points along the front.

The workshop offered two builds. One continuous piece that follows every face, at a slightly higher cost for the extra work and material. Or three separate cushions that meet at the corners, cheaper and easier to fit.

The piping follows that decision. A single piece carries one unbroken welt around both corners; three pieces give you three outlines meeting at the joints, and with a contrast welt you will see them. Decide early, partner, because it changes the drawing, the cutting and the quote. Run your bay through the [bay window calculator](https://cushionguide.com/studio/bay-window-calculator/) and read the joint options in our [3-sided bay Pattern](https://cushionguide.com/guides/bay-window-seat-cushion-3-sided/).

## On the cutting table: olive trapezoid

|   |   |
|---|---|
| Cushion | Trapezoid box cushion spanning a three-sided bay |
| Fabric | Olive linen-look with ivory, codes 924 / 910 |
| Piping | Contrast, ivory |
| Edge | Box edge |
| Setting | Slim ledge over a cast iron column radiator |
| Measure | Every edge, clipped corners included, plus straight-line depth |
| Build options | One continuous piece or separate segments |
| Best for | Sitting-room bays and morning reading ledges |

## Buyer questions

**A common question:** I need three tufted cushions for a kitchen breakfast nook in odd sizes: 65 1/8 x 17 in, 56 1/4 x 17 in and 91 x 17 in. Can you work in fractions?

**The workshop's answer:** Yes, fractional-inch sizes are fine. All three were made as button-tufted linen cushions in Dried Rose on one custom order. Write each size exactly as you measured it, fractions and all, in the order note; the quote then carries the production and delivery times.

**A common question:** What do you need from me for a trapezoid or clipped-corner bay window cushion?

**The workshop's answer:** Every edge: front, back, both sides and any small clipped corners, plus the depth, measured straight from the highest point down to the base line. The workshop cross-checks the depth from the sides; one buyer's 86 in top, 126 in bottom and 26 1/2 in sides gave about 17.4 in (44 cm). Mark cut-outs, like a window handle, on the drawing.

**A common question:** Can I buy extra back pillows or armrests on their own?

**The workshop's answer:** Yes. Straight back pillows, extra L-shaped corner backrests and pairs of armrests are all sold separately. An L-shaped backrest can also be swapped for a straight one at the same price.

> Contrast piping earns its place on a bay window cushion when fabric and wall share a tone: ivory on olive keeps every angled corner readable.
>
> — Nate

> **Tailor's margin:** Trapezoid depth: halve the difference between the long and short edges, then square-root the side squared minus that. 86, 126 and 26 1/2 in give 17.4 in.

## Questions buyers ask next

### When does contrast piping beat self piping on a window seat?

When the fabric and the wall behind it are close in tone. Olive against sage paneling blurs in soft daylight, so an ivory welt keeps the front edge and angled corners visible. On a fabric that already stands apart from the wall, self piping is enough.

### Can a window seat cushion sit over a radiator?

Yes, and the seat stays pleasantly warm in winter. Keep the ledge shallow and let the cushion stop at its front edge rather than overhang it, so warm air can still rise past the ledge into the room.

### Is a wraparound bay cushion better in one piece or three?

One continuous piece has no joints at the corners and costs a little more for the extra work and fabric. Separate segments cost less and are easier to fit. Choose before you draw the template, because the piping and cutting change with it.

## Related at the atelier

- [Bay Window Cushion Makeover: Terracotta Trapezoid, Brown Piping](https://cushionguide.com/readings/terracotta-trapezoid-bay-window-cushion-brown-piping/): One terracotta trapezoid bay window cushion can make a white bay the warmest spot in a room, as long as everything around it stays pale and dark brown piping ties it to the brass and oak.
- [Bay Window Cushion From Above: Where to Spend, Where to Save](https://cushionguide.com/readings/trapezoid-bay-window-cushion-top-down-view/): On a bay window cushion, spend your care on the measurements and the foam, and save on decoration.
- [Bay Window Cushion Makeover: Oatmeal Linen, Charcoal Piping](https://cushionguide.com/readings/oatmeal-trapezoid-bay-cushion-charcoal-piping/): An oatmeal linen-look bay window cushion with charcoal piping is the safest makeover for a bare bay cabinet: it suits almost any room and draws a clean line around the whole trapezoid.
- [How do I order a cushion for an angled bay window seat?](https://cushionguide.com/answers/bay-window-seat-cushion-angled-order/): Order an angled bay window seat cushion on the trapezoid (custom-shape) listing, not the rectangle one, choosing the size by the seat's depth and overall length.
- [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.
- [How do I measure a bay window seat for a cushion?](https://cushionguide.com/answers/how-to-measure-bay-window-seat-cushion/): Measure a bay window seat by sketching it from above and writing every edge length on the drawing: the back edge against the window, the front edge, each angled side, and the depth from front to back.
- [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/olive-trapezoid-bay-cushion-over-radiator-sitting-room/