One reason spandex and other tight fabrics may be fetishized is that the garment forms a "second skin", acting as a surrogate for the wearer's own skin. Wearers of skin-tight nylon and cotton spandex garments can appear naked or coated in a shiny or matte substance like paint. The tightness of the garments may also be seen as sexual bondage. Another reason, at least pertinent to nylon-spandex fabric, is that the material can have a very smooth and silk-like finish, which lends a tactile dimension to the fetish - as well as a visual one.[1] The pressure of tight garments against the genitals can become quite sensual.
