underdress

(un′dər dres′)

intransitive verb

to dress more plainly or informally than is indicated by the occasion

See underdress in American Heritage Dictionary 4

noun

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

intransitive verb (ŭnˌdər-drĕsˈ) un·der·dressed, un·der·dress·ing, un·der·dress·es

To dress too informally for the occasion.
To dress without sufficient warmth: You're underdressing that baby for such a cold day.

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