is there a link anywhere to reference clothing sizes? Since I know the Big 3 patterns can be off in sizing, I would like to be able to make something & then take my measurments of that outfit & look up what size it would fall under, especially for things I make with no pattern at all.

I don't know if this is exactly what you are looking for, but here's a link that might be of help:

http://www.fibergypsy.com/common/children.shtml

ETA: you might want to check these against Burda, or another pattern that fits decently. Oh, and if you do have a Burda kids pattern, or get one soon, there is a sizing chart on each pattern, inside on the pattern pieces, that goes from newborn to teen age clothing size. I mounted this on a heavier paper, and taped it to my wall, by my sewing machine for reference.

oh that's great Dina! Thank you! & I will get a Burda pattern as well!