This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Apparel worn beneath outer garments; underclothing.

n. An outer garment, such as a dress beneath a tunic or coat, that is worn as part of a costume or suit.

verb-intransitive. To dress too informally for the occasion.

verb-intransitive. To dress without sufficient warmth: You're underdressing that baby for such a cold day.

v. To dress in insufficiently warm clothes.

v. To dress in insufficiently formal clothes.

v. dress informally and casually

v. dress without sufficient warmth

"A severely plain underdress of heavy white satin formed the foundation."

overdress   

underdressed    underdressing   

dress    get dressed    raiment    garment    tog    enclothe    clothe    garb    habilitate    fit out   

cramoisy    kerseymere    gusset    carder    pongee    sacque    pouf    over-blouse    peacoat    pajama