This is crocheted in 2 parts, front and back, and then the neck and sleeve bands are crocheted on once the tank top is sewn up.
The initial band is a bit of a killer to crochet. It is done on a 2.5 hook, which if you're used to using 5s or 6s for blankets, seems awfully small. It is not difficult, just never ending. However, once you've got over that hurdle, then it is easy and fast, just treble, chain, treble, chain, all up the body.
The neck and armhole shaping need care in counting, but if I can manage it anyone can, lol.
The neck band is quite plain, but the arm bands are a delight, and really make the tank top into something a bit special.