ELKEX L size denim The back half of the waist is elastic. A friend who wears LL size bought these because they were comfortable with the elastic, but they said they were tight when sitting, so they are only tried on. Although they are new and unused, my friend's house uses mothballs in the dresser, so they have that smell. Please refrain from purchasing if you are sensitive to smells (^-^; #Chani's Shop Clothes