In day-to-day life, I depend heavily upon my Mossimo Long & Lean Tank Tops from Target. They are soft, lightly ribbed, perfectly stretchy, form-fitting, just the right length, and so comfortable. I wear them nearly every day for every activity imaginable: sleep, exercise, going out, you name it. They are my second skin. My white Long & Lean tanks get the most love, as they're the ideal undershirt/layering piece (be aware: the white tank is a bit too see-through to be worn on its own, which also happens to make it a wonderfully practical lingerie option sans bra). Target offers a fabulous selection of seasonally-updated colors and regularly puts these tanks on sale for $8 each; the usual price is $9. These truly are the best tank tops ever.