I initially ordered a 2T but when it came it was clearly too small. I exchanged for a 3T. It does fit but if she grows more than an inch anytime soon, it'll be too small. She's 34" and 27.4 pounds. I'd say if you want a looser fit, try sizing up two sizes. They're absolutely adorable though!
I love a good overall on little ones. These are too cute, though I do suggest to size up.