It's a battle of the brands... J.Crew vs. Banana Republic.

Michelle Obama may be a J.Crew devotee, but the first lady chose a tank from retail rival Banana Republic for an afternoon of mini golf while vacationing with her family on the Gulf Coast.

Mrs. O wore the Banana Republic Dreamer Dip-Dye Cami in Chrome blue; currently on sale for $69.99 at Banana Republic stores and online.

She paired the silk top (available in regular, petite, and tall sizes) with cropped black pants and Maison Martin Margiela toe-loop sandals.

The camisole's slight color variations gave her ensemble a breezy, summery vibe.

Mrs. Obama kept her vacation look low maintenance, wearing her hair in a tight ballerina bun and opting for simple jewelry.

Meanwhile, see what Banana Republic and other mall brands (including J.Crew) have in store for fall.