This is Cat Can Lolita brand Rabbit Good Night JSK full set, featuring a sleep themed pattern, rabbits, carrots, and mushrooms. It comes with a matching winter hat, detachable bows, and a night mask themed rectangle headdress with removable rabbit ears.

I've only tried it on, so it's like new. I actually used the winter hat in the winter, so that's in used, but good condition. It's good enough quality to keep my head warm for the entirety of MI's winter.

I removed the tags, because I planned to keep it, but in between the time I bought it and now, my bust size got bigger than the JSK's bust, so my bust is where the waist on the JSK should be.

The measurements on the listing are as follows:
bust: 90-118 cm
waist: 82-112 cm
size I don't know the translation of, but I think it's how long the JSK is: 88 cm

The sizing is accurate, but if you're at the upper limit, then you may run into the same problem I currently have.