pin-stripe

noun

1. a very thin stripe, especially in fabrics.
2. a pattern of such stripes.
3. a fabric or garment having such stripes.

noun (in textiles)

1. 1. a very narrow stripe in fabric or the fabric itself, used esp for men’s suits
   2. (as modifier)a pinstripe suit

adj.1882, from pin (n.) + stripe (n.). Figurative of “executive” by 1958.