i avoid constrained in general. changing your folds won't do a thing about how it slips.  you need to change friction.

look up the collision friction in the manual.  it probably doesn't do what you think it does.  what you're toggling is whether you use the individual collision friction settings or whether to use the friction settings in the dynamic set.  if you don't change those from the default, then you won't get any change in performance. 

if you have one piece of clothing, and one prop or figure you're colliding against, it doesn't make a difference.  you might as well just use the main friction settings.  but the default won't do about anything.  i got fairly decent results when i had both dynamic and static friction at 0.9 for something i didn't want to move where it was against the skin.

i'm away from home and on my mom's laptop so i don't have reliable access.  pardon if i don't reply soon.