I realize every child is different, but am just curious about this. I went to our Carters/osh Kosh outlet and bought all 2t clothes (12 pants, 15 shirts, 1 winter coat, 1 fall coat, 3 pair of shoes, and 2 hats for $80)
I'm just hoping he'll be in them for a while! He wears 18/24 mo. shirts, 18 mo pants right now.
Re: How long did your LO wear size 2T?
Like you said..every kid is different. DS is tiny and still wearing clothes from last year, size 2's.
My chunky monkey is wearing some 2T shorts right now. What can I say? The babe got his mama's thunder thighs!!!
Lol, thanks for the laugh!
He may be in 2T for a while as he grows and gets taller too! 
He wore it for about 7 months. He only wore 3T for a few months. He grew a lot this spring.
DS2 can wear 2T now. The other morning DS1 asked why DS2 was wearing his pjs. I took everything from his closet and up it right into the other.
DD went from 18-24 month clothes to 3T over night. She was in 2T for maybe a few months but not long enough to really get good use out of them. She also went through a huge growth spurt right around 2. She was 35 inches at her 2 year appointment and just yesterday she measured at 37 inches. I refuse to buy any pants until she stops growing.
"When it comes to sleeping, whatever your baby does is normal. If one thing has damaged parents enjoyment of their babies, it's rigid expectations about how and when the baby should sleep." ~ James McKenna, Ph.D., Mother Baby Behavioral Sleep Center, University of Notre Dame
He wore mostly all 2T until about 4-6 months ago.
He is currently 35lbs if that helps.