This is a 2T outfit—he was in it under 2 and she’s in it over 3! I’ve been meaning to put her in it for quite some time now and finally did it today; the pants are slightly too short but the jacket is almost too big.
Edited to add: Whoops! Those aren’t the right pants! Now I remember why I haven’t put her in that outfit before now… I couldn’t find the pants that go with that outfit!