A lovely dress can make a casual evening feel special, a formal event feel comfortable, and a gator-hunting expedition feel more whimsical. Ornament any occasion with today's Groupon: for $15, you get $30 worth of clothing and accessories from T.I.L. Darling.

Founded by two fashion-obsessed London college students, T.I.L. Darling's online boutique bedecks ladies in modish styles ranging from flirty to fancy. Lightweight frocks such as the Moon Collection sleeveless floral dress ($42) winsomely flutter in summer breezes, attracting maximal compliments and minimal swarms of bees toward its blushing blooms. The Esley cocktail dress ($75) adds a dash of flapper-style sass to formal occasions with dazzling copper sequins and a rhinestone-dotted ruffle that can glint off the vintage details of a clutch designed by Betsy Johnson or Steve Madden. For a layered look, the sheer Enti burnout top ($22) lets a soft tee or camisole or secret love of Saved by the Bell reruns peek through its bold, nature-inspired print.

T.I.L. Darling's entrepreneurs of elegance update their stock frequently, constantly refilling their easy-to-browse sartorial reservoir with current trends and often deeply discounting sale items to make way for new arrivals. The boutique ships its duds for a flat rate of $7 (not included in the Groupon) within the United States and—unlike an ice cream truck—lets you return and exchange purchases that don't suit your taste for free.