I don't really think you should say anything. I also don't think it should be a topic of discussion among so many people.
A while ago, I noticed an unpleasant odor on a woman I dealt with weekly. She was the secretary of a group, and the smell would attach to the paperwork she distributed as well as surround her. To me, it smelled like mold. After a few weeks, I figured out that it was her hand lotion that was the base of the problem and wondered if perhaps her lotion had gotten "old". Nope. I checked it out at the store, and that's what it smelled like new.
Come to find out, other women in the group also disliked the smell, but none of us thought it would be right for us or anyone to ask her to stop wearing it. I wish I could remember more of that conversation and how we came to that conclusion so that I could pass on the wisdom of that group, but it all boils down to.....you shouldn't say anything.