Call them what ever you want if they are baggy then in the event of a slide the material will grab and probably tear, at best the armour will move out of the way of what it was designed to protect,
Bike kit needs to be tight to work at its optimum.
Most kit worn these days is a size too big to allow for other warmer layers or to make it more comfortable for the rider, mine included.
A lot of offroad designed gear is baggier around the knees to allow for knee braces etc as your not going to slide far compared to tarmac