Have had a Mullion suit that was bril...so good m'burglar took it with him when he went thru m'garage!
b@st@rd!
I think they were Mainstream that we had after that-which were cr@p - rain went straight thru. Got a batch of Fladen suits now & they are fine. Better for sitting in all day winter cod fishing than coping with the neck seal on a drysuit but they obviously aint immersion proof.
Whatever they say I don't think any are truly breathable though. As soon as you put a layer of foam inside the fabric it sorta defeats that principle. So it can get a bit damp inside one.
We have bought ours at "Gerry's of Morecambe"-mail order angling gear as he always had good offers on when we wanted suits so might be worth looking on t'internet though I haven't looked for quite a while.