Sounds like there are some serious warning signs going on- how old is your son? Have there been any dramatic changes in his life (even ones adults are fine with, but maybe he is having some trouble understanding)? Have a talk with him- let him know you have noticed your clothing is getting cut- but don't do it angry or upset, just let him know you are trying to understand what he is wanting to communicate and be available to listen. If you can't get to the bottom of the issue this way, it's time to bring in a doctor and counselor to help walk you through this- you don't want to ignore warning signs and just brush them off- get to the bottom of this now so you both can work through whatever the issue is together.