slouchy
adjective /ˈslaʊtʃi/
  /ˈslaʊtʃi/
 (comparative slouchier, superlative slouchiest)
- (disapproving) holding your body in a lazy way, often with your shoulders and head bent forward- his slouchy posture
- Straighten up, you’re too slouchy.
 
- (approving) (of clothes) without a definite outline; not stiff- The slouchy suede boots look great with slim pants.
- a beautiful slouchy leather bag
- The jeans have a relaxed slouchy look.