Bum bag by Fred Perry, For those just-in-case necessities, Adjustable body strap, Secure clasp fastening, Embroidered branding, External pocket, Zip fastening. Fred Perry's authentic menswear collection is heavily influenced by the brand's historical roots in sport and classic, urban menswear. The range, including the iconic slim fit polo shirt, blends British style with the edge and attitude garnered from the brands unique streetwear credentials.