The larger size, listed as 90, doesn't have a size description, but it's roughly a 95-100 size. I paired it with a long-sleeved T-shirt underneath during this season. The size 90 one is small, maybe around an 80. Please refer to the photos for the size reference. I used these for my children who are a year apart. They were worn by a 1-year-old and a 2.5-year-old! For your reference. Matching outfits are very cute. The larger one has some pilling. Please understand and purchase if you are okay with this. Set of 2 Sorajiro T-shirts, year-apart sibling outfits, sister/brother outfits.