Until your children start buying their own clothing, YOU are responsible for what they wear. Rips, bad hems, buttons off, stains, out-grown... all of that is YOUR fault and responsibility. The first three you should have taken care of before the item made it to their room, and the last, you should have removed at the first sign of it being tight. You are also responsible for making ‘modest’ choices and for teaching them to do the same. It is more than possible to be stylish and modest. They won’t learn it if you don’t teach it. ALSO, you should practice it so they can learn by your example.