The pattern has a drafted guide on the neckline for where to turn under and hem it. This is much easier than inserting a neckband and works very well on this casual shirt. For this version, the sweater knit is so stretchy that I added clear elastic to the neckline and the shoulder seams.
The sleeves lightly grip the upper arms and hold position perfectly so that the shoulders stay put.
I think I first saw the pattern on this blog: https://thornberry.wordpress.com/2015/04/16/tessuti-mandy-boat-tee/ She has made several cool versions!