As SD mentioned its the MM resort that has the pool parties, the gentsclubs.com site has all the info and their discord site has daily photos of the line ups at all their places. The pics are normally accurate but the blokes a wizzard with AI for a lot of his flyers, so if its looking too good, beware.
External Link/Members Only External Link/Members Only They often bring in freelancers for the parties, so quality and quantity can vary.
The Factory in Bongkoch 8
External Link/Members Only External Link/Members Only end of the road on the right if coming from 3rd Road. Has a pool. Dont know about organised parties. Newish place, open a year or so
Theres also an organised Baht bus from the Buzzin lounge in pattaya out to Pratanak (the area between Pattaya and Jomtien). And thats for an organised party. Cosy Beach Club bit run down, quiet area.
External Link/Members Only External Link/Members Only Cant remember the date, Its always on the third wednesday or something like that. You have to go to the buzzin lounge and buy your ticket there. You are probably best contacting Buzzin directly.
As for clothes, Id just keep your shorts on and put your wallet phone shades somewhere with your shirt and footwear. If you take a lady ST then your put you shorts in the sun and they will be dry by the time your finished