wrote:
I need to find a long orange hi-vis vest ... it's easy to find them in
polyester but, despite spending a long time on Google, I can't find
cotton ones - are they available?

http://www.ebay.co.uk/itm/371065259972 - that's yellow, but the manufacturer labelled as Helman and they might do an orange (GO/RT for rail use?) version?
http://www.helmanworkwear.co.uk/

or cut the sleeves off a cotton hi vis jacket?

Owain