I've definitely had the issue when we get hand me down clothes, of sometimes clothes from the thrift store. Recently someone gave my dd a box of clothes and I had to wash them multiple times w/ different combos of borax, baking soda, and vinegar rinses to get out the fabric softener. I can smell people when they walk past me in stores or other places who use Downy or other strong smelling fabric softener. It's gross. The fabric softener smell in particular gives me a headache. Same with perfumes. I just finished reading Debra Lynn Dadd's Home Safe Home book and she talks about MCS, mulitple chemical sensitivity, and I think I had it before, but all my clean living, has sort of made it worse. It's a good book rec for sure. She has a website too, just google Debra Lynn Dadd. She's great.
I just got a Berkey water filter the dechlorinates our city water as well as a dechlorinating shower filter and now the smell of chlorine coming out of the washer and tap is reallllly strong to me. Almost burns my nose. Weird.
When traveling, I almost always bring my own pillowcase and blanket. It's getting to the point where I might just bring my whole bedding set, sheets and all. I also travel w/my own toiletries (don't use the hotel ones) and have even been know to travel w/my natural all purpose cleaner (when we were staying for a week on the beach).
We also moved into an apartment recently, and one of the things I really don't like about it is we can't control the pesticides sprays outside or I actually think they sprayed the inside of the unit before we moved in. Though it's better than my old house, I think that because my old house was a New hous (only a few years old) it was making me sick with all the new house smells (carpet, glue, paint, varnish, etc.).
My friends just bought a brand new $3000 tempurpedic mattress and slept on it the first night they got it. I shudder to think of the off-gassing on that one. I won't be going over there any time soon. I can just imagine the headache I'd get from that one. I just hope they don't put their 9 month old on it. He already is sooo sick, constantly, but they don't co-sleep and he sleeps in another room, so hopefully he won't be on it. Anyways, that was way off-topic....