Kellsport 18 oz. sweatshirts are mens sizes. They are a full generous cut. No need to upsize. Smaller women and kids can generally wear the smaller sizes with no problem. Sweatshirts can be exchanged for size, or returned if not as expected. It is sometimes difficult to judge a full cut sweatshirt from a size chart. Sweatshirts are not "fitted" like a regular dress shirt or sport jacket. We have included some size examples from actual people in our factory based on height / weight. And of course, it all depends on how you like the sweatshirt to fit. Some like it snug, while others prefer the loose and baggy feel.
Chest sizes can be confusing for sweatshirt sizing. Keep in mind that your suite size or shirt size does not really relate to sweatshirt sizes. Suit jackets and dress shirts are made to lay flat against the body. Sweatshirts are loose and comfortable fitting, and will have much larger dimensions than suits.