This is a three-piece suit set purchased about three years ago from Perfect Suit Factory. The jacket, vest, and slacks were sold separately, and I believe the total cost was around 45,000 yen. I've outgrown it due to weight training. When I bought it, I was 170cm tall and weighed 65kg, and it fit perfectly. It's made of stretchy material and doesn't make your shoulders stiff, so it's ideal for business casual wear. I think it can also be worn privately. It hasn't been altered, so the size should fit someone who was a Y4 size and of a similar build to me at the time. It's machine washable.