Meffia slouched and sagged along, a semi-boneless creature, her clothing hanging on her baggily and unbecomingly.
"puffed out, hanging loosely," 1831, from bag (n.) + -y (2). Bagging in this sense is from 1590s. Baggie as a small protective plastic bag is from 1969. Baggies "baggy shorts" is from 1962, surfer slang. Related: Baggily; bagginess.