Truth is, even though silky blends feel luxurious, the better fabric for your vagina when its insulated by layers of cold-weather gear is plain old cotton. So if you have material that irritates your skin normally, you might have minor inflammation to the area. Cotton is known to be one of the most breathable types of fabrics out there, which makes it better for your skin — and also your vagina. Well, yeast thrives on moisture — so if you trap moisture in your fussy silk and mostly nylon blend underwear , you're creating a prime breeding ground for an infection ouch. Dardik says.