How do we say : ‘she wears elegant dresses’ in spanish ? !

Ella usa vestidos elegantes.

Explanation:

She wears elegant dresses.

She = Ella

Wears can be translated into uses, so "to wear" conjugated into he/she/you (formal) form is usa.

Dress is usually "vestido", however, since it's plural, dresses = vestidos.

Adjectives come after a noun in Spanish, as well as takes a plural or singular form accordingly, so elegant in this scenario = elegantes.

Ella usa vestidos elegantes.