This is likely a T-shirt for SD17 size dolls. I purchased this new, unopened item on Mercari, listed as SD size. However, upon arrival, it was visibly too large, so I haven't opened it. For this reason, I'm unsure of the exact compatible size, but the shoulder width is about 14cm, so I believe it's either SD13 or 17. Please check the photos. Please understand the above before purchasing. If you have any questions, please comment. The ruler is not for sale.