Smiffys Smiffys is a fancy dress manufacturer specialising in party fashion, leisure and entertainment products. There's no better way to get a party started than in costume, and here at True Range we've got plenty of fancy dress ideas to choose from! From birthdays and nights out to Halloween costumes and of course Christmas costumes, make every event amazing with one of our most popular fancy dress costumes and accessories. Turn parties into memories with a costume from the Smiffys range.