Woman Within takes up to 75% off its clearance items. Coupon code "wwcomeback" cuts an extra 40% off your highest-price item. Shipping adds $5.99, or get free shipping with orders of $75 or more via coupon code "WW21157". (Coupons don't stack.) A few best bets, with prices after code "wwcomeback":
Nordstrom offers the Topshop Women's Gingham Tube Skirt in White Multi for $23.99 with free shipping. (Topshop charges the same.) That's $21 off list and the lowest total price we could find. It's available in sizes 0 to 6-8.