9 Best Seamless Underwear for Any Outfit, Tested & Reviewed 2026

To find the best seamless underwear, we turned to our editors and contributors for their favorite picks. To meet different buyer preferences, we wanted to include a range of styles (low, mid and high waisted thongs, briefs, bikinis). Each pick on this list has been worn at least 10 times (and washed in between) to assess their durability. We rated them for their overall comfort; the quality of their material (how breathable it was; whether it retained its shape over time); and of course visibility.

We tested each style by wearing them under everything from leggings to figure-hugging dresses to ensure there were no annoying lines or gathers. Our testers wore these underwear during daily activities (commuting, relaxing, working, exercising) to get a real feel for how each style performs in motion. We also considered value and practicality (strong underwear with tummy control might be what you’re looking for when heading to a wedding, but cheaper, less valuable pieces may be better suited for everyday use). On this list, you’ll find a range of fits, coverage levels, and brands offering inclusive size and color options.