These four words get used interchangeably in trim shops, and two of them genuinely are interchangeable. Here is which is which, so you order the pattern you actually have in mind.
Houndstooth — pepita in German and Spanish usage, pied-de-poule in French — is a figure of broken four-pointed shapes produced by a particular twill threading, not by printing. Two practical consequences follow: the pattern is visible on the reverse of the cloth, and it cannot wear off, because it was never applied to the surface in the first place.
Scale matters more than colour:
Tartan is a grid of crossing bands of differing widths, defined by the order of the threads. British English tends to say tartan; American English says plaid. Unlike houndstooth it has an explicit grid, and it usually carries more than two colours.
For a trimmer the practical difference is single but significant: tartan must be matched across seams. A large grid does not forgive a shift between adjacent panels — the eye catches the mismatch immediately. Houndstooth is far more tolerant.
| What you want | What to use |
|---|---|
| Lift the interior without changing its character | medium or fine houndstooth |
| Make the car a statement | large tartan |
| Narrow inserts, headrests, bolsters | fine repeat only |
| Whole backrest and cushion | large houndstooth or tartan |
| Light interior that must not feel heavy | ombré check |
They are not pattern names; they are shorthand for a palette. None of our articles is the factory cloth of any marque and none is sold as such — they are fabrics in the same spirit, a pattern and a palette rather than a copy. There is more on this in the piece on plaid interiors and where the pattern came from.