The word "old-clothesman" refers to a person who sells second-hand clothing. However, there are a few different synonyms you could use to describe this profession. You might refer to this type of seller as a "thrift store owner" or "vintage clothing dealer." Other options include "consignment shop operator" or "retro apparel vendor." Depending on the specific type of clothing being sold, you might also use terms like "antique clothing dealer," "used designer apparel seller," or "vintage fashion purveyor." Regardless of which term you choose, it's clear that sellers of second-hand, pre-owned garments can offer unique and valuable finds for shoppers looking for something beyond what's commonly available in current retail stores.