The term 'become baggy' can be summarized by the crossword solution SAG, which is an acronym for 'Shrinkage and Ageing of Garments'. This term refers to the process of clothing becoming loose or baggy over time due to a combination of factors such as washing, drying, and general wear and tear. SAG is a common problem in the fashion industry, as it can lead to garments not fitting properly and looking less attractive.