I've made this shirt a couple times and found it to run very short and wide. This time I sized down 1 size for width, and sized up 2 sizes for length, and it fit nicely. Comes together quickly. The shaping at the bottom hem is very nice too, looks good untucked which is usually how button down's end up on a 5yr old!

My son wears a size 98 for most Ottobre.