24 months vs 2t

As most of you know  Baby Bear  is now a little over two years old. But she isn't the same size as most two year olds. She is 26 months old and wearing 18 month clothing. She is skinny and getting a little tall for 18 months. So today we have decided to go see how 24 months or 2t fits her. From what I have read 2t should fit better. But I'll definitely let you know what we find out!