The only clothing I find offputting on a date is something she feels uncomfortable in, and wishes she hadn't worn (eg a skirt so short she spends all evening howking it down, and having to contort her legs to preserve any modesty). I want her to be relaxed, comfortable and to have a good time. If she makes herself feel awkward the whole thing can be a bit difficult to retrieve.
The most important accessory she can wear is a smile.
Wear skiny or fitted jeans & a fitted shirt or one belted at the waist, or at least right uder the boobs (baby doll style) If you tucked a top INTO your jeans, there'd be NOOOO WAY for me to resist you, but that's just IMHO... LOL What outfit do YOU like most that makes you feel good about yourself & feel that it flatters you most & makes you look best? Girls are usually their own best judges about what looks they pull off best, so whatever you like best & feel best in, he'll love you in it & agree that it's your best look...
For me, it's a whole package. You need everything to work, make sure your hair is in it's best style (I love straightened hair), make sure you have awesome smelling perfume, and and as for the clothes, I don't know what kind of date you're going on. If you're going somewhere fancy, then a really sexy red or black dress is always good. If it's more casual... then just find something that you feel comfortable going out in public in that you know looks good. Ask some guy friends what they think if you'r really worried about it.