You don't need to scrutinise every last inch of the photo
Grimmers himself has admitted he pinched it off Harry.
I couldn't give a monkey's tinkle whether Harry is gay - maybe it's as simple as he likes the company of more mature people, he certainly casts his romantic net in the good sea 30+
Harry was wearing the grey jumper when he arrived at R1 in Nick's car one morning and when they left Nick was wearing it. It looks more Nick's size to me. Pics and video clip are around of this IIRC.