Wave slalom is fun and widens the gear options so don't need dedicated slalom kit to be in the mix. A couple of old wave slalom pics from my archives.
First pics are a wave slalom comp in circa 1983, over 40 years ago - before there was any dedicated slalom gear. (I'm on the cobra sail with homemade board).
Second pic is a wave slalom start at 1986 Rip Curl wave classic, Torquay (I'm Q16, behind Phil McGain and Bruce Wylie on Gaastra sails).
Coincidently, WA-1 is Dave Sheen who is the guy doing the back loop in the Windrider footage that is in the Wave Rally video above.