My daughter is 35 3/8 inches and about 27 lbs. She fits into a size 3t on shirts and some pants in length (not waist-often held up by a belt). Her 2t coat fits in length of arms, but not height and is tight at the shoulder. Should I size up to a size 3t or 4t? I'm looking at Lands End Down Coats. The 3T goes from 36-38 inches and the size 4 starts at 39 inches. She is also very skinny. I'm leaning toward the 3T based on the fit at the chest, but concerned about getting a sweater under it.
Any help is appreciated.