Yellow Ralph Lauren long-sleeved shirt, size 18, with embroidered logo. - Brand: Ralph Lauren - Size: 18 - Color: Yellow - Design: Embroidered logo Thank you for viewing. This is an American kids' size (for 18-year-olds). Although it's kids' size, I think it's about the same size as a Japanese men's S. Width: 42 cm Length: 73 cm Measurements are approximate. I was given this for maternity wear, but it was too big for me even when my belly grew, so I've only worn it 2-3 times.