Gidk what your wardrobe is but personally I would run a 2 piece suit or just a blazer with some kinda floral shirt if I was going to a real casual casino and trying to look nice
Gthe 3 piece might be a lil overkill but then again who wouldn't want to look really classy while going to a casino or higher end hotel
GYou are really overthinking this I think. Wear whatever you want because they surely don't care.
GThrow on a sport coat and you will probably be among the best dressed
GJust be comfortable, mentally and physically, in whatever you wear and enjoy yourself
Bchelsea boots can potentially go with tailoring i read
GSure, chelsea boots are fine. So are any sort of dressy boot. You wouldn't wear an obviously-workwear boot with a suit but otherwise go for it, this is ........ low stakes 
Gchelsea boots just make any slightly formal fit 10x better
Gexcept tuxedos all my homies hate tuxedos
