flatter (one's) figure
To fit one's body well and make it look especially attractive, as of clothing. You look gorgeous—that dress really flatters your figure!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
flatter one's figure
Fig. [for clothing] to make one look thin or to make one's figure look better than it is. The lines of this dress really flatter your figure. The trousers had a full cut that flattered Maria's figure.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.