For just a tank top rated that is undoubtedly not an undershirt, this a single from Amazon ticks all the best boxes. Having experimented with it on ourselves, we love its slim-but-not-tight fit which makes it functional for workouts or daily wear, along with the super soft material to me https://fernandopgtgs.homewikia.com/11116959/helping_the_others_realize_the_advantages_of_lilly_pulitzer_tank_top