Is that why Stokes is wearing it? New ink?
I wear Skins A400 sleeves as I tend to hyper-extend my elbow the wrong way sometimes. Not sure why it happens but they have certainly helped. I had some tubigrips but to get as much support, you really have to pile it on (Like Stokes) and they don't tend to be hard-wearing - but thats the fashion at the moment.
I would imagine for Stokes that its about injury or protection as he is not as 'big time' as someone like Pollard who it seems to be a fashion statement (Though fashion statement would be better that than what I heard - that he scrapes his elbows when diving so wears tubigrips to protect them!!)