That slim strip of white above a sweatshirt depends on how two necklines line up. Use your own sweatshirt to compare the front, sides and back before buying a tee for the layered look.

A crewneck can sit high in front and still lift at the sides. Follow the edge of the neckband from shoulder to shoulder to see whether the cut gives you the smooth line you want.

A tee can have the right chest width and the wrong neck opening. Use a comfortable shirt as your reference, then make a more informed choice about the cut, the size and whether to start...

A high crewneck frames the base of your neck. A mock neck covers part of it. Compare the two under an open jacket, on a warm commute and worn alone to work out which detail...

Two heavyweight tees can sit at very different heights on your neck. Here’s how to read the collar in a product photo, compare it with a tee you already own, and decide whether the HIGHR...