
A shoulderless sweater is an off-shoulder or cold-shoulder knit, not a crewneck you tug down. US listings split a wide boat neck that can sit on both shoulders from cut-out cold shoulders that keep a collar. Stay-put elastic or rib at the neck matters more than a pretty fold in a photo. Cropped lengths change bra choice; hip lengths layer over high-rise denim.
Check fiber for itch and stretch, then decide if you need a strapless bra or if the remaining straps will show.