Regatta Microfleece Unboxed
in Southampton (and other stores across the UK) are currently selling a Microfleece Underwear set for £12.49. The set comprises of a set of black microfleece long johns and a 1/2 length zip necked pullover. Whilst not the highest quality fleece, you get what you pay for, the set could prove a cheap and effective part of your spare clothing kit or combined with thermals a good option for wearing under a dry suit.
My only concern using the microfleece top with drysuits using a latex neck seal, would be the zip neck. Whilst not a high collar it could interfere with the latex seal so I might look at rolling the collar in on itself and stitching it down to form more of a round neck. This would mean the zip could not fully close but would allow me to use the set under my Palm Aleutian Drysuit without damaging the neck.
Go outdoors seem to have plenty on the shelves at the moment, although they seem to shift stock quite quickly!
Regatta Microfleece Box Set
Regatta Microfleece Set Unboxed
Regatta Microfleece Top and Longjohns