Costume Shop Finder Cardiff Costume Shop Listings page. This section lists as many Costume Shops we could find in Cardiff. If you are the owner of a Costume Shop in Cardiff please submit your listing using the Get Listed link at the top. These Cardiff Costume Shops offer costumes and fancy dress for adults or children in Cardiff, 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 Cardiff.