I bought a pair of x-scent clothes from the sierra trading post on clearance and they work great! I just got back from a four day visit with friends and family and I did not stink. (externally at least)
I kept them on the entire time (NEVER took them off in four days, did not want to risk it 
with no deodorant (forgot it at home) and no change of clothes. (I was not expecting to stay so long)
When I took them off after getting home the stink hit me like a bomb! I was smelling like a skunk under the x-scent thermals but the smell did not escape.
Your mileage may vary but I consider it my most successful test so far. I have also been on 1000mg chlorophyll for one month. But I have not noticed a big difference in the actual odor.
Problems:
Arms are too short on the pullover, I mean REALLY short. I have shorter arms then most people and they were two inches too short for me. (Wore them underneath a dress shirt so no one would notice)
The long underwear had painful Lycra ribbing along the waist. I may need to sew a liner into the ribbing to make it more comfortable. Plus the long underwear was cut in a very odd way high in the front and low in the back. I wore them under some pants. (go up a size on the pants to get a comfortable fit)
I can see why these were on clearance
And they are fairly expensive even on clearance. However the smell blocking stuff is supposed to be woven into the fabric so you can just buy one set and wash them frequently, and it is not supposed to wash out.
I would like to hear if anyone else has tried them, it would be nice to know if this was really working or if it was just my imagination. I will try them out again soon and report back.
Fair winds and following seas,
Matt