I washed it, gave it lots of extra rinses and dried it thoroughly.
Within 10 minutes of having it on, the horrendous itching started again! I ended up with such a bad case of hives I had to take piriton.
This morning, I compared it to my other bras and I've noticed this bra has a very 'rubbery' 'soft' foamy texture. It could be that it has latex in the material.
I'm not wearing it again, that's for sure. I bought the dove-grey one as well and matching pants. What a waste of money.
Alternative, was it this bra?
www.marksandspencer.com/sumptuously-soft-underwired-padded-full-cup-t-shirt-bra-dd-g/p/p22354670?colour=Fawn
60% polyamide, 23% polyester and 19% elastane