Find an old, oversized t-shirt. Trace your chosen shape with a sharpie. We cropped the front of the shirt and added a flattering, low back. Cut along the lines with a good pair of fabric sheers, try the shirt on and make any desired alterations!
Sew Circuit tried this tank not too long ago! DIY workout tank - I love the loose fitted tank tops from Under Armour, but they can get expensive. This is a good way to recycle old t-shirts and get new running gear at the same time :)