I've had some good Maths lessons out of dimensioning pencil skirts, pattern re-sizing, and the 'hang' of a dress related to the orientation of the warp and weft

I've had some good Maths lessons out of dimensioning pencil skirts, pattern re-sizing, and the 'hang' of a dress related to the orientation of the warp and weft of the cloth. And there is always the small business angle. Perhaps more mundane than OP. Note: I teach basic maths in vocational colleges in UK.