Tights enclosure fetish
From wipipedia.org

Tights enclosure fetish is the fetish of being entirely or partly enclosed in tights. In addition to wearing a pair, someone may for example want to wear a stocking mask and have their arms in the legs of another pair. Two or three pairs may be worn one over the other, especially over the head to act as a blindfold. Stockings may of course be used instead of or as well as tights.
Apart from the fetishistic attraction of tights, this may be a cheap substitute for a zentai or catsuit.