underclothing(n = noun.artifact) underclothes, underwear - undergarment worn next to the skin and under the outer garments;
is a kind of undergarment, unmentionable
has particulars: bvd, bvd's, intimate apparel, lingerie, long johns, skivvies
Same as Underclothes. [1913 Webster]
underclothing, n. underclothes collectively.