I just wore one size oversize sweat pants and ran the tube out the leg cuff. I didn't do anything different for sleeping. For sitting, my recliner was fine.

One suggestion: I hung the cath bag in a big plastic bucket (3 gallon) with a lid to keep our dog out. I cut a V in the lid for the tube. I carried the bucket around. I live in a rural area, so I went out for walks around our front pasture carrying the bucket. My wife did all the shopping, so I just stayed home. I never used the leg bag until I went back to the doctor to have the cath removed.