Oldwoman70
Some of you seem to have misunderstood - the couple had dressed up, they rarely go out and this was special for them. My friend hadn't bothered to so much as change her sweater, she hadn't had a busy day (we had spent most of the afternoon chatting over coffee). I am not normally a "judgmental" person, accepting people for who and what they are but on this occasion I just felt she could have made a little effort.
... then I don't think it matters what we say - you've decided she didn't make the effort you though she should.
If you both spent most of the afternoon chatting - she's hardly likely to have got 'mucky' and sweaty drinking coffee and, assuming she showered in the morning, I'm guessing she looked presentable?
TBH, under the same circumstances, I too might have done the same - unless what I was wearing was a tad scruffy, and you haven't said anything to indicate she looked that way. If you hadn't seen her that day - you wouldn't have known she was wearing the same sweater.