Costume Shop Finder Boston Costume Shop Listings page. This section lists as many Costume Shops we could find in Boston. If you are the owner of a Costume Shop in Boston please submit your listing using the Get Listed link at the top. These Boston Costume Shops offer costumes and fancy dress for adults or children in Boston, including theatrical and party costumes, Halloween costumes and costume accessories. Most Costume Shops listed below also offer costume accessories such as masks, wigs, make up and props in Boston.