UGG Help Please!?!?!?

I am planning on buying another pair of UGGs. The pair I have right now are Chocolate Clic Short, and they are size 7, they are tight, but still wearable. When I had bought those I was a size 6.5 and I went up to size 7. Now I would like to buy Chestnut Bailey on (Short) UGGs. I am currently a size 8 and my feet are not done growing (will probably grow another size or so). I went to the outlets and tried on a pair of 8s and a pair of 9s...With the 8s they fit me good, and how they are supposed to fit. But with 9s I could feel enough room for my feet to grow. Do you think I should get the 8s or 9s?