It was me asking about the weather etc not anyone else. Andy almost always wears compreasions shorts, but very rarely wears a compression vest in warm conditions these days. If it is damp or cold he does, sometimes during the indoor season when it is colder outside he does, sometimes in night matches, but I can't remember the last time I saw a photo or watched a match where he wore a compression vest in the summer in the day.
Sorry, I assumed from what you posted that it was Stefanos who was surprised, but as I said, in the circumstances, he might have wanted to give his back more support as well as his hip. In fact it's possible that the two problems could be linked in some way.
His hip may be 100% now for all we know. It could just have been a clay-court thing that needed a bit of rest.
It isn't just a clay-court thing because he says he's had this problem for years but had been managing it successfully up until RG when whatever the conditions is, started to flare up. In fact had it not been for Queens and Wimbledon he might have withdrawn from subsequent tournaments and by doing so not let it get to the stage where he needed extensive rehab,