Are there rules for this?

There is a code i personally adhere to when and if i go out on dates -

If you're going to the movies, a walk in the park of a picnic ever dag clothes like jeans overhemd, shirt and sweater will be fine.

If it's a lovely avondeten, diner for two maybe a cute little dress with pumps and a jas to go over the top.
Any dress will do but i prefer ones with the leg o mutton sleeves link
of an off the shoulder ankle length thing.
I don't really wear high heels, but u can if u want.

Really it's up to you. u can wear whatever the hell u want, it's your date. If u feel pretty in your birthday suit go in your birthday suit, just be prepared to get arrested for streaking halfway through avondeten, diner though...and be careful with soup...that can be very hot.

Yes, I would most certainly say there is; in fact there's one in particular for all of life & that is: don't wear short of revealing things (e.g short shorts/skirts/tops/dresses, bikinis, low-necked tops, spaghetti-strap top, ect.), because guys are visual & if they see too much of your flesh, then they're going to think of u sexually (not that they won't still like u for your personality, but just try avoid that kinda wardrobe). There's plenty of fashionable modest clothes out there & they're not that hard to find :).