bottom line is---if you are using a commercial pattern---check the pattern for the permissions given-often the designer will include permission to sell, display, personal use only ect-
if there is no such permission anywhere to be found- send an email & ask- it doesn't cost anything to ask permission to use someone's design- and always give credit where credit is due- include the name of the pattern or designer on your label- don't try to claim it as your own.