- Design: SMFK VINTAGE Retro Collection utilizes vintage-style materials and post-processing techniques such as garment dyeing/washing/salting/stone washing to present the retro texture of the clothing. After the garments are sewn, they undergo garment dyeing (multiple water dyeing), followed by a salting process (color blending) and a sanding process (sanding to create a matte velvet texture and gray tone on the surface), achieving a traditional dyeing and long-lasting retro texture. The SMFK classic zip-up long-sleeved top is made of silk-cotton ribbed material and is finished with garment dyeing. It combines the design of a long-sleeved outerwear and innerwear.