Thanks Clare, it does make sense to avoid going too small for sure.
Mostly I was concerned about compromising the 'wicking' ability of the garments by going too large but that is probably not much of a risk once the Protec has been 'vacuum packed' at the start of the dive
JB; thanks for the offer but I should be able to try on the various sizes once they are back in stock, if I was ordering over the net I'd have taken up your offer though.
Fortunately my LDS is only slightly more expensive than the best prices I can find out there.