I agree with the group- and this has zero to do with dressing. You're being taken advantage of. Plain and simple. You're not doing them any favors by letting them be lazy.
I think, sometimes parents start believing that their adult children don't need to be disciplined. They need to know life isn't fair sometimes. We learned it. It's time they did too. That unfairness, has to come from somewhere, and you got picked to hand it out. Actually, life is being unfair to you right now- but you can hand it back. You paid you dues, I'd bet 6 times over. The outside world won't cut them any slack. Why should you?