Wesco appears to be a shop, not a suit brand name. RaceQuip is the brand. The suits you have linked there are all SFI-rated, which means they are NOT karting suits, they are Nomex suits. It’s very important you don’t accidentally buy a Nomex suit, as it will NOT protect you in the least in a karting accident, since it has no abrasion resistance and will fall apart if you go skidding across the track. It also isn’t legal per any rulebook.
Make sure when you’re looking at suits that it’s specifically a KARTING suit and has abrasion resistance. Brands like Alpinestars, Sparco, OMP, K1, GForce all make karting specific suits.