Trench Coats: Single Breasted or Double Breasted?

I like the double breasted ones myself, especially the Burberry's. Ironically, I went to Bloomies last weekend to get one, but they only had the single button ones. They were definately very nice, but not what I had my heart set on.
 
A well-cut double breasted trench -- nothing is more chic! I got my mom an amazing one from Burberry two Christmases ago. It's black with a slight sheen to it and it's the shorter length which is perfect for petites. I wish I had gotten myself one when I had the chance but I haven't seen one like it since.