69% matchHeist Studios
Fit-data DTC approach, seamless construction
What changes: Tights-first assortment, smaller bra range
Brand profile
US direct-to-consumer bra label known for half-cup sizes, the 24/7 Classic T-Shirt Bra, an online fit quiz and Try Before You Buy trials.
4 brands like ThirdLove like Heist Studios, Skims, Honeylove →

The size run is built around fit rather than seasonal styling, including half-cup measurements that most bra makers had skipped.
Sales run mainly through its own site, where an online fit quiz and a Try Before You Buy trial replace fitting-room guesswork.
The 24/7 Classic T-Shirt Bra anchors the assortment, with wireless, lace and strapless versions plus underwear and basics around it.
69% matchFit-data DTC approach, seamless construction
What changes: Tights-first assortment, smaller bra range
82% matchShade- and size-inclusive DTC intimates at scale
What changes: Shapewear and loungewear led rather than engineered bra fit
74% matchDTC fit-engineering pitch, wireless bras included
What changes: Core focus is sculpting bodysuits, not everyday bras
71% matchBigger, older US player across bras and shaping
What changes: Broader apparel range and higher price point
ThirdLove is a direct-to-consumer intimates label founded in 2013 by Heidi Zak and David Spector, organised around bra fit rather than seasonal fashion. Its range centres on the 24/7 Classic T-Shirt Bra alongside wireless, lace and strapless styles, underwear and basics, offered across a wide size run that includes half-cup fits the industry had largely ignored. The brand sells mainly through its own site using an online fit quiz and a Try Before You Buy trial programme, and markets with plain-spoken, size-inclusive imagery.