These are denim overalls with frills. They were my favorite, and I kept wearing them even after the hems got short, but they're still wearable, so I'm putting them up for sale. They have buttons, so you can wear the top and bottom separately, but the elastic waistband on the pants was loose to begin with, so I never wore them separately. To prevent the straps from slipping off my shoulders, I used to cross them in the back and button them up＾＾ I think you can also wear them backwards, so there are various ways to wear them. The size is 100, but I wore them even after I was over 100cm tall, so I think they can be worn for a long time!