The fit you select gives CustomFit a starting point
Close fit sweaters are intended to be worn next to the skin, or over one thin layer. They should never feel tight, but neither should they offer enough room in the shoulder area for a thick layer.
Average fit sweaters are a great place for most people to start. They'll offer enough room for a solid under-layer, and skim the body without clinging.
Relaxed fit sweaters are great choices for when you'd like to wear your sweater as outerwear, or you're looking for a slightly more slouchy look. They'll accommodate a substantial underlayer and will be larger than your body everywere.
Oversized fit sweaters give you a lot of room in your sweater. They fit like relaxed fit sweaters in the shoulders, but you'll get more ease in the torso.
Want to see these fits in action? Here's a link to to a visual explanation of the differences between our fits. Right now, I only have pictures for close, average, relaxed, and oversized hourglass fits on women.
As soon as I have enough sweaters, I'll add images (and videos) showing all fits on adults & kids. But in the meantime, if you have questions please don't hesitate to ask, and remember that you can always adjust the dimensions of your own sweater using the "customize fit specifics" screen!