Craft Industry Alliance had an interesting article about the legalities around selling things you’ve made from patterns you’ve purchased. I’m sure you’ve seen the warning not to sell things you’ve made from a pattern, especially those from independent pattern companies. There are always “ifs, ands, or buts” with the law, but it appears that no one can really stop you from selling items that are considered “utilitarian”, which clothing most definitely is. Let the sewer/seller/buyer be aware.