I've decided that they run a bit small. Not unusual for style items of that caliber. It will really depend on the particular garment--if it is cut to be close-fitting, you may want to get the next size up. My recommendation is to try stuff on before you buy it, or if you buy it online to make sure that you can return it if it doesn't fit.
I agree they do run a little small. I have a few pieces from him, and had to return a couple of things to take the next size up. I do have a few shirts that were TTS for me, but with the dresses I have to take the next size up. Are you interested in a particular garment?