This Big Time Rush photo contains
pantleg, pantalon, hip boot, thigh boot, pantalons longs, des pantalons longs, and pantalon long.
There might also be
chaussant, le tuyau, bonneterie, tuyau, jambes nues, collants, pantalons moulants, skintight, pantalon skintight, pantalon collant, and collant.