Quote:...it painfully digs into the spine bones if your neck is pressed against the floor (e.g. in halasana, aka the plough).
Any sort of zipper will do that, as will the poppers on key-hole back suits. I bought a 'shoulder-entry' suit with poppers on the side of the neck specifically to avoid that problem.

That said, it's rather to tight around the neck so I usually wear a retro scoop neck leo and stirrup tights for my yoga. OK, the stirrup tights are a compromise but classically you should do yoga barefoot and (with a few exceptions) leggings just don't press the right buttons for me....