All of our sweatshirts are cut similarly.
They fit long and slim. If the material says it is a Triple Stretch, that means it is VERY stretchy and you may even prefer to size down.
If the material says it is a Double Stretch, that means there is SOME stretch and you should be comfortable in your normal size.
If the material says it is a Single Stretch, that means there is LITTLE stretch and you will likely prefer to size up.
Our SingleHood sweatshirts are made in our Triple Stretch fabric but are fleece lined, so that does affect the stretch slightly. You may prefer to size up if you're not looking for a fitted look.