Peanuts - Snoopy Be Happy Dance Short Sleeve Graphic T-Shirt

So, my 4 year old in in a size 6/7 and so when I saw that after 5T it's S, M, L, I opted for the S thinking it would be a 6/7. This shirt runs huge! It's at least the equivalent to an 8/9. Not necessarily a bad thing as he can grow into it, but I wanted him to get to wear it now. I'm still giving it 5 stars because at least it runs big and not small! Needless to say, I will definitely be getting my $20 worth as long as he will be able to wear it. Im not entirely sure the difference in the 5T vs S, but if you're buying this for a small child, a S will be far too big! You may even check the size chart if there is one, I normally do, but didn't this time for some reason.