This yellow sweatshirt is Gap Kids and pictures Snoopy & Woodstock.

It is size XL. It measures 18 1/4" across from one underarm seam to the other, the bottom measures 16" across, the sleeves measure 16 1/2" along the underarm seam, and the length is 19".

For a great fit I recommend comparing my measurements to something similar that you have that fits you comfortably.

M3