I bought the 2T for my 3 year old granddaughter, she is quite small for her age and they fit her perfectly. I think if I wanted to go taller I would go up a size to be a bit taller and longer so she could wear them with tunic-like cycling shorts. But the colors are gorgeous and vibrant, the stitching is quality and will last a long summer. They are cotton so they don't stretch which is ok, I like good cotton shirts for summer I think they are cooler. But most importantly she loves it and will wear them, they're not worth money if the kids don't wear them.