I think the point of finding something good to wear at a strip club is something that will allow a lap dance to be easily felt through. Jeans and other thick fabrics won't give much sensation through. Dress slacks, in particularly loose ones, will probably work great. Wearing briefs probably isn't a good idea either. You want you goods to move around when she works you. If everything is all strapped up tight, there will be less sensation, so try boxers. If you don't precum much, you could go commando.