The correct rewritten sentence using double object pronouns for 'darme el vestido' as an affirmative Uds. command is 'Dámelo.'
Dámelo.
The correct sentence that rewrites 'darme el vestido' as an affirmative Uds. command using double object pronouns is Dámelo. In this sentence, 'Dá' is the affirmative Uds. command form of the verb 'dar' (to give), 'me' represents 'me' as the indirect object pronoun, and 'lo' represents 'el vestido' as the direct object pronoun.