I’ve had this material for years, maybe even decades.
I made the T-shirt as instructed, with a 1″ neckband. All finished. I could have put it in the closet, but i wanted to do something special with it. I marked 1 1/2″ below the seam for the neckband and cut it off.
I measured around the neckline and subtracted 3″. This material is very stretchy. If it wasn’t, I would have subtracted about 1 1/2″. With that measurement, I made a band that was 6″ wide. Mark the center front, and make two 1/2″ buttonholes, 1″ apart, about 1/2″ below the fold line. Sew the seam on the short ends, which is your center back. Fold the band in half, and pin at front, back and sides. I ran my tie through the neckband before I pinned and sewed it to the top, but you don’t have to. Serge around the neck.
I also made a sweatshirt-type front pocket. I made a bottom band and sleeve bands, also 6″ wide (folded over and seamed, this is a band about 2 3/4″ wide).
The sleeve of this top can be tapered for a more snug fit. In this case, I shortened the sleeve 3″ to accommodate the band, and gathered it a bit.
I finished the tie with beads.