I’d say avoid cotton sweat pants- the sprinkler system at snowflex will get them soaked pretty quickly and then you’ll just have really heavy pants. Track pants would be good. It seems like most people do that or just regular snow pants.
You’ll definitely want gloves of some kind. The snowflex will rip up any skin you put down when you fall. I usually use pipe gloves because they’re light, but I see people wear gloves like this too https://www.amazon.com/dp/B001YJHEDW/ref=cm_sw_r_cp_api_i_.ds8CbBYZQWFC
Elbow pads are a good idea if you want to wear short sleeves and more so for protecting your skin than for impact. Some people even just cut up tube socks and slide them over their elbows.
I also think that that they might sell light gloves and elbow pads there