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A Reading by NateBay Window Cushions

An oatmeal trapezoid bay window cushion, and how to mix patterns around an angle

One plain, one texture, zero stripes on the seat. The garden supplies the pattern. Here is the geometry behind that choice.

The quick answer

On a trapezoid bay window cushion, keep the angled seat plain or softly textured and put stripes on rectangular pillows, because a stripe meets the angled ends on a slant. Take the piping from one outside color, like blush pink from flowering shrubs. Order with front length, back length and front-to-back depth; with equal sides, the angle follows from those three.

Read by

The Pattern Engineer of DetroitPublished 4 min read

Oatmeal linen trapezoid cushion with blush pink piping on a white bay window bench with brass pulls, garden and fence beyondSave
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Flax linen bay window cushion with wine-red piping, linen pillows and a striped lumbar on a white storage benchSave
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Mocha brown linen-look trapezoid bench cushion with teal piping, cream pillows and a linen throw on a white bay seatSave
Teal piping on mocha is an unexpected pairing that keeps a brown cushion from looking heavy.
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Terracotta linen-look trapezoid window seat cushion with dark piping, knit pillows and olive lumbar on white oak cabinetsSave
A warm clay color makes the bay glow even under a gray sky, and the dark welt keeps its angled end sharp.
Dove gray linen-look corner nook cushion with caramel piping on a three-part oak drawer base between two garden windowsSave
One cushion wraps a corner with a 45-degree middle section, so there are no gaps between seats.
Oatmeal linen-look trapezoid bay window cushion with charcoal piping on white cabinets with brass pulls, dark wood floorSave
Oatmeal linen with charcoal piping is the classic contrast, and this low angle shows how the end turns into the bay.

Pinned by Nate, across three sashes

Five pins, from the angled end at the side sash to the jute rug under the cabinets.

Pinned: Oatmeal linen trapezoid cushion with blush pink piping on a white bay window bench with brass pulls, garden and fence beyond
  1. Angled trapezoid end

    The end is cut to the bay's angle, so there's no gap against the side window.

  2. Blush pink piping

    A pale pink cord is subtle indoors and picks up the flowering shrubs outside.

  3. Back edge along the glass

    The back runs along the center sash, shorter than the straight front.

  4. Brass bar pulls

    Warm brass hardware sits better with pink piping than chrome would.

  5. Jute rug

    A textured natural rug grounds the white cabinetry.

  1. Angled trapezoid endThe end is cut to the bay's angle, so there's no gap against the side window.
  2. Blush pink pipingA pale pink cord is subtle indoors and picks up the flowering shrubs outside.
  3. Back edge along the glassThe back runs along the center sash, shorter than the straight front.
  4. Brass bar pullsWarm brass hardware sits better with pink piping than chrome would.
  5. Jute rugA textured natural rug grounds the white cabinetry.

Card one: what the bay is doing

A stripe laid on a trapezoid always loses its argument with the angle.

This bay window cushion sits on a three-sash bay built over white shaker cabinets with brass bar pulls, a fenced garden beyond. It is cut as a trapezoid, so each end runs parallel to its side sash with no gap against the glass. The back edge follows the center sash and is shorter than the straight front, which is simply what a bay does to a rectangle.

The fabric is oatmeal linen-look, close enough to the white cabinetry to blend, with a slub that reads as texture rather than pattern. A thin blush pink piping is the only color in the room, and it answers the pink flowering shrubs outside. The brass pulls help; warm brass sits better with pink than chrome would. A jute rug grounds all that white paint. No backrests, no pillows: the view stays open.

So where does a pattern go? Angles are just lengths in disguise, partner, and a stripe is a set of parallel lengths. Run a stripe front to back on a trapezoid and every band is sliced diagonally at the angled ends. Run it side to side and the bands shorten row by row toward the back. Either way the angle wins. In the gallery, a flax bay cushion takes its stripe on a lumbar pillow instead, which is the rule in one picture. Where would your stripe go?

Card two: where each pattern belongs in a bay

Plain on the angle, stripe on the rectangle, texture underfoot.

LayerPatternWhy
Angled seat cushionPlain or softly texturedAngled ends slice any stripe on a slant
PipingOne color from outside or the hardwareA single line survives the angle cleanly
Lumbar or back pillowsStripeRectangles keep the bands square
RugNatural texture, like jutePattern by weave, not print
The viewWhatever grows out thereLet it be the loudest print in the room
A real project

Card three: a hand sketch missing one number

A buyer sent a hand sketch of a large bay seat: 95 in (241 cm) front, 61 in (155 cm) back, 22 in (56 cm) angled sides and 10.5 in (27 cm) straight end edges. The workshop redrew it as a clean diagram and noticed the front-to-back depth was missing.

From the sketch alone, the depth works out to about 24.5 in (62 cm). The back is 34 in shorter, so each side steps in 17 in; a 22 in side stepping in 17 in rises about 14 in; add the 10.5 in ends. The buyer then measured the real seat: 27 in (69 cm). That 2.5 in gap is the whole reason the depth goes on the drawing.

They chose 3 in (7.5 cm) thick, approved the revised diagram, and production started. Run your own numbers through the trapezoid cushion calculator before you order.

Card four: stripes, wall backs and washing

  1. A common question

    Is fabric N03 gray? And which piping would match its darker stripe?

    The workshop's answer

    N03 is actually a cream and beige stripe, not gray. Piping in 108, 110 or 912 goes well with the darker stripe, and the contrast cord in the listing photo is 108 from the velvet chart.

  2. A common question

    Can you make channel-tufted backrests that mount on the wall above a banquette?

    The workshop's answer

    Yes, and the build depends on the mounting. For hook-and-loop tape, adhesive or loops on a rod, they are made as filled fabric cushions. For screwing to the wall or flush mounting on a beveled wall cleat, they get a solid wood or MDF board inside.

  3. A common question

    Is the linen-look fabric all right for a nursery? Can I machine wash it and hang it to dry?

    The workshop's answer

    Yes. The linen-look fabric is polyester, and it can be machine washed and line dried. The workshop steers nursery buyers away from cotton, which copes less well with washing and everyday furniture use, and suggests velvet as another good option.

Card five: the numbers

CushionTrapezoid bay window cushion, box edge
FabricOatmeal linen-look (polyester)
PipingBlush pink contrast cord
EndsAngled to run parallel to the side sashes
Order withFront, back and front-to-back depth; sides as a check
Sketch in the story95 in front, 61 in back, 27 in (69 cm) deep, 3 in thick
CareLinen-look can be machine washed and line dried
Pattern loadOne plain, one texture, stripes only on rectangles
Best forBays where the view does the decorating

Order this cushion

Have it made

Have this made — ask Nate’s workshop

Send the numbers in inches: length × depth × thickness, plus any angle. The workshop checks them with you, because foam has no undo button. — Nate

Leave your details and the workshop will call you to confirm measurements, fabric, foam and piping. No prices, dates or payment on this page: it is a request, not an order.

Fabric · Foam · Pipingwhat the workshop will confirm with you

Fabric
Oatmeal linen-look (polyester)
Foam
The core: its density and thickness set the feel.
Piping
Blush pink contrast cord
Only for this request: no marketing calls or texts. Outside the US, add the country code.
In inches: length × depth × thickness, plus any angles or cut corners.

* Required. A member of the workshop team will call you to talk it through; nothing is charged and nothing is made until you have agreed on every detail with them.

We use these details only to answer this request and make your cushion: your name and contact details, the cushion details and photos you send, the page you came from and the ad or link that brought you, if any. The workshop that makes the cushions receives them. We don't sell them or share them for advertising, and we delete requests after 24 months. Privacy notice for requests.

Nothing is made or charged until you approve the details.

Want to pick the shape and add photos? Use the full quote form

On a trapezoid bay cushion a stripe meets the angled ends on a slant. Keep the seat plain and give the stripe to a rectangular lumbar pillow.

Nate
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Questions buyers ask next

Can a trapezoid bay cushion be made in a striped fabric?

Yes, but the stripe meets the angled ends on a slant, so bands are cut off diagonally at each end. Many people keep the angled seat plain and move the stripe to rectangular pillows, where the lines stay square.

How do I choose piping for a plain oatmeal bay cushion?

Borrow one color from what you see through or around the window. Here a blush pink cord repeats the flowering shrubs and sits well with brass pulls. On a striped fabric, pipe in the darker stripe's color instead.

Which measurements does a trapezoid bay window seat cushion need?

Front length, back length and front-to-back depth, drawn as seen from above. With equal angled sides, the angle follows from those three. Add the side lengths as a cross-check; if they disagree with the depth, measure again.

± 1/4 in — Nate