By Phia

Michael Costello is a fashion designer with a studio and store in downtown Los Angeles, known for elegant evening gowns. He began his career by opening a boutique in Palm Springs, where he created dresses and other garments for women.

Michael Costello shopping guide

Everything you need to know to get the best deal at Michael Costello

How to redeem a Michael Costello promo code

  1. 1. Add your selected items to your shopping bag at Michael Costello.
  2. 2. Open your bag and continue to checkout.
  3. 3. Find the field labeled Promo Code or Gift Card, then enter your code and apply it.

Troubleshooting a Michael Costello promo code

  1. • Check for typos — codes are case-sensitive and can’t contain extra spaces.
  2. • Confirm the code hasn’t expired or reached its usage limit.
  3. • Some codes require a minimum spend or exclude sale items.

Expert ways to save at Michael Costello

  1. • Use the most valuable code when a retailer does not allow code stacking.
  2. • Check current sale items before applying your code.
  3. • Install Phia to automatically test available codes at checkout.

Stop overpaying at Michael Costello

Phia finds the working code — and applies it before you pay.

iOS App| It's Free

Explore more Michael Costello products

More Michael Costello products