I tried a lot and took notice. I'm pretty fit and always get complimented on my style. If (girl)friends would describe me, it would be that I'm always well put together. I've got dress shirts, pantalons, suits and tons of men shoes. Suiting up however rarely does anything for me but people asking me why I'm in a suit (lol).

I haven't really find it matter at all. I've had the most hookups just wearing simple garments; an oversized sweater, a cap and jeans and some boots or 15$ sneakers. Maybe a watch, and that's it. Still well enough put together (matching colors etc.), but nothing fancy at all and she would have no idea about my physique at first.

I've got friends with the worst style ever still getting on with girls who apparently can't give more than one shit about it. I've got skinny friends who lift absolutely nothing getting on with girls. I've got skinny friends with the worst style ever and lift aboslutely nothing getting on with girls.

If a girl fancies you, it barely matters.
If you're hot without fancy clothes, it barely matters.
If you're confident enough, it barely matters.
If you're just at the right time at the right moment, it barely matters.

You should dress in a way that makes you feel confident about yourself. If that's a suit; go for it. If that's an oversized sweater and cap... Maybe that's just your way! If you're relying on certain brands or suits because it -should- bring in eyes (and girls), you're just in for a confident-breaking disappointment.