If you've got an old t-shirt with a neckline that you're not a fan of, it's pretty easy to transform it into a V-neck. Just use a seam ripper to remove the front of the neckband, up to the shoulder seams. Fold the shirt in half lengthways, and measure NO MORE than 3cm down from the original neckline. Cut on a diagonal using really sharp scissors, then cut the neckband in half. Stretch out the two halves, pin back onto the shirt, and sew together.