Home owners can install sliding doors in most double-door doorways of the house, provided the sliding doors are the right size. A sliding door doesn't work in an average single-door doorway, because there isn't enough space to slide the door back to enter.
As of 2016, The Home Depot sells various types of sliding doors for interior doorways, including closets. It also sells sliding doors for patios and back porches. Some sliding closet doors are covered by full-length mirrors. TRUporte, Impact Plus and Contractors Wardrobe are brands that make mirrored sliding closet doors. They also make sliding closet doors with frosted glass panels.