Where I went to school (
SFASU), all the NPC sororities wore a coach's jacket (we just called them windbreakers). Granted, I graduated in 1992, but from what I remember, it was one of the first things we got with letters on it (after a shirt and a tote bag). Since we had spring rush back then (it has since moved to fall), these jackets came in quite handy.
Letters were the sewn-on type, placed on the left side, 2 inches tall, going horizontal. They were solid color with another color behind them. Your first name was embroidered in the contrasting color (the backing color of the letters) underneath the letters. Nothing else was on the jacket.
From what I remember, these were the color schemes (everyone in each sorority had the same colors - you could tell who was in what sorority just by the jacket color):
Alpha Chi Omega - green jacket, red letters, white backing
Chi Omega - red jacket, red letters, yellow backing
Delta Delta Delta - royal blue jacket, royal blue letters, yellow backing
Delta Zeta - pink jacket, pink letters, green backing
Gamma Phi Beta - white jacket, white letters, red backing on gamma, yellow backing on phi, blue backing on beta
Zeta Tau Alpha - blueish turquoise jacket, blueish turquoise letters, silver backing
Sigma Kappa - purple jacket, purple letters, silver backing
Gamma Sigma Sigma also had windbreakers - maroon jacket, maroon letters, white backing
Hope that helps!