The other thing you may not be aware of is it could be clothing causing it too , so you may have to factor that into the equation . Helly-Hansen "LIFA" tops are made from Polypropylene and can kick up a right pong within minutes of being worn . We were issued with Polo Shirts a few years back and within minutes of getting out of a shower and donning them ..... you ponged . I managed 45 minutes and removed it and looked at the label , can`t remember what it was made of but went back to Cotton T-Shirt . I`m not a smelly man by nature , even after being in the wilderness for a few days . Some people can get affected by their diet ..... so I would start off with something like "Blimey , I had a Curry last night , you can`t half tell there was a load of Onion in it , I can smell it on me" . See if he/she joins in the conversation , you have formed a common bond then and try to eke the conversation out without being too obvious , gain their trust ... then tell them "Everyone thinks your a smelly Bast**d"