You’ll have to visit the particular club you’ll be working and take note of what the others are wearing. In some places, gowns (long, nearly floor-length dresses) are required attire, in others, buttcheeks must be covered (find some tiny, tiny booty shorts), and still in others, anything goes. In some places, bikinis are popular (and they aren’t the kind you wear to the beach, if you don’t want to look like a rookie), and in others, corsets, or rompers, or garter belts, or stockings, or themed outfits, or any number of things. It really depends.
I worked a topless club in which dancers thought that a g-string redeemed them from being like the nude-club whores, somehow validated their version of the trade to their boyfriends or significant peoples in their lives. I currently work a nude club with an “anything goes except tennis shoes and jeans shorts” policy, and I wear a lot of short (a little ass-showing) dresses, bra-and-g-string combos, and usually throw on a pair of leg warmers to protect my poor ankles. Others wear gowns, and still others run around in a g-string and stockings, barely covered at all, and none of us look particularly out of place because of clothing. It all depends on the club.
It’s a trial-and-error process. What looks fantastic on one girl may not highlight your own beauty. If you have a great ass, show it off. Great tits? Find something revealing in that area.
There are tons and tons of websites that sell stripper clothes. Here’s one that I Googled in about three seconds. Buy online or at a boutique that caters to strippers in your area. Target/Walmart thongs are discernible from a mile away.
You will look like a wreck for the first several weeks. You likely have little idea of how to dance, what to wear, social courtesy, rules, hustling, and the like. You’ll be nervous as hell. Time passes and you learn. It’s like anything: you’re not going to walk in and be great. We were all new once. Remember that. That even the hottest girl or the best dancer was new, once upon a time.