MY RANT FOR TODAY….
Just cataloged an instructional DVD titled “Sewing beyond the basics: kitchen accessories”. The DVD includes a bonus CD-ROM with patterns.
I wanted to add the subject heading: 150 — |aSewing|vPatterns but this is invalid.
Instead it is a reference for 150 — |aDressmaking|vPatterns or
150 — |aTailoring|vPatterns
the DVD’s accompanying patterns are NOT about dressmaking – they are about sewing kitchen accessories.
Cataloguing Aids Blog 
I agree that seems almost back-to-front, except that one could as easily have patterns for either sewing or dressmaking without either implying the other (ie make dresses without sewing and as in yours sewing from a pattern not for a dress).
Although it does not quite meet one’s desire – if it is not too broad, is there a heading for Textile crafts — Patterns ?
There is a heading for Textile crafts–Patterns
It just seemed too broad for what I was cataloguing. I really wanted to bring the ‘kitchen’ aspect into the SHs.
The ideal heading would have been Kitchen linens–Patterns
(but sadly I just made that one up) LOL