Translation of "Baggy" in Japanese

These pants tend to go baggy at the knees.

このズボンはひざが出やすい。

- Since my husband became sick he's lost 20 kilograms and his pants are now baggy.
- Since my husband became sick he's lost as much as 20 kilograms and his pants are now baggy.

病気をしてから夫は２０kgも体重が落ちて、ズボンなどはもうぶかぶかです。