【Vest-Style Undergarment with Salt-Serge Collar 1 Piece】 Easy, style-free undergarment! Since the sides are not closed, you can adjust the neckline to your liking. You can insert your own collar core into the collar part. Dimensions (approx. cm) Width: 40 Length: 60 Quality Body: 100% Cotton Hanging Collar: 100% Polyester A great value 2-piece set is also on sale☆