Other variations include arousal from wetting or seeing someone else urinate in their pants or underclothes, or wetting the bed.
en.wikipedia.org Could you try on clothes in any shop, any time, without worrying about your underclothes?
en.wikipedia.org The institute provide board, lodging, fuel, lights, washing, arms, equipment, medical attendance, uniforms and all clothing, except underclothes, for $200 per annum.
en.wikipedia.org In addition, one suit for common wear, rubber shoes, umbrella, bed linens, blankets, toilet articles and underclothes were expected.
en.wikipedia.org