L has been in mostly 12 month stuff since July. The length is perfect right now. But the 18 month stuff is sooo long, except at oldnavy....that stuff fits already.
I'm starting to accumulate her fall/winter wardrobe and keep going back and forth between 12 vs. 18.
I know smart people will say wait to buy it when you need it, but this is Canada. Winter lasts forever, so what she wears in September she'll be wearing in April.