Collocations for gown - noun

long
floor-length
elegant
flowing
She was dressed in a long flowing gown.

strapless
ball, bridal, evening, wedding

be trimmed with sth
She wore a white satin gown trimmed with lace.

in a/the gown

academic
hospital, surgical

in a/the gown

town and gown (= the residents of a university town and the members of its university)