It really depends the kind of activities that are offered. As I ask only one piece and good quality snow suit. I know those are.expensive but also they protect well so, I just do my best to keep them in good shape. Our activities are outdoors I make colored ice cubes, spray paint on snow, shovels and buckets, balls, bubbles. we have a slide I just use more snow to keep it clean. I make little mountains of snow so they can climb and roll down on the snow. I do not place pushing toys or cars. I know they will get muddy and I need their snow suits dry for the next day's activity. But even if one gets wet for any reason I have around three extra snow suits. To go home nice and dry. We do a lot messy activities ex. Yesterday jumping on puddles after that I just use the garden hose and rinse them off. But nothing that can damage their winter gear.