Well, it's just practical to have more than one. And in the colder weather, it's good to have winter boots.

[No matter how resistant Saiyans might be to harsh conditions, there's no disputing that having wet, frigidly cold feet is a highly uncomfortable experience.]

I'd have to come up with a rough design...but I'm sure something for shoes could be thrown into the mix, too. Maybe a drawer in the wardrobe could have shoe compartments in it.