I was searching for gray fabrics yesterday and kept saying, "There are so many shades of gray!" Gray can have a brown, green or purple cast to it in so many of the fabrics. The easiest and most successful way to work with gray is to keep the amount of pattern to one or two pieces. Example below:
This gives the cool sophisticated edge that works so well in a gray palette. To add interest and depth use solids that have subtle pattern or texture...here are some by Highland Court.