I am going throught this at the moment and it is very difficult indeed. I wrote a post which may help:why clothes make us ill
Iactually have no clothes as mine are all in black bags in the garage - they have all been contaminated with a perfume and I cannot for the life of me get it out. I still do not know where this perfume came from, perhaps on my partners kilt suit he wore at christmas, god knows but it has completly made my MCS unbearable and I am reacting to many more things more quickly than ever before. I lie in bed thinking like I am lying next to someone with perfume on. Life is now h3ll, the h3ll worse than before. I am still sleeping in the lounge on sofa cushions with a sleeping bag. No pyjamas, no bra, no slippers, no jumpers etc. I have a few pairs of socks and pants, a pair of jeans a pair of joggin bottoms, 4 tops, 1 jacket - that's it. I am glad it is not winter.
I bought some new clothes and they stink. I, like you, find that things stink more when I get home. I can be out and ok and when I get home I become aware of perfumes which have now stuck on my skin and clothes. Apart from trying to rid the clothes of the manufacturing stink, if someone has tried the item on then it can be imposible to remove their perfume.
Before you wash anything - treat it. Sun & fresh air first for a week really helps. Then I'm spraying on vinegar or alcohol (vodka) and letting it dry in the sun, repeat a few times. Then wash and repeat this process until the clothes are bearable - wash them alone. Make sure you do an extra wash without any vinegar or alcohol before wearing as even those are annoying me. Remember though, sun can and does fade things.
You are not alone. I bought a mask for MCS and had to return it because it stank of perfume. It was either made by someone wearing perfume or the retailer's staff wear perfume although they claimed they don't. Funny that a letter that arrived from them stank of the same perfume.
I hope you find some useful tips here. Good luck.