Sorry you had someone so RUDE! She should not be concerned about what you are doing with it. She should be glad you came there and purchased, in which to help the cause make money. And for all she knew you could have been making something for another charity or something. And with the cost of fabric and especially wool these days who can blame someone for buying clothes,... it saves alot in the long run and helps quilters and crafters out too!... Stand your ground!... It wasn't like it was hers to judge, she was just the lady behind the counter. Our local thrift stores are just happy to sell! (Or at least they don't voice their opinion.) She may need to take a course in manners and how to work with the public!...
Penny