I would be put off by that too... I don't think therapists should be expected to dress formally or anything, but they should be held to the same standards that most people are in the workplace. I guess the same sort of dress code that, say, a teacher would have? Otherwise it just suggests to me that they don't treat the job (or their clients) with very much respect, I guess.

I don't often notice my T's clothes (though I would if he was wearing a hoodie and ripped jeans!), though the other day he was wearing his shoes - he doesn't usually - and I noticed they were pretty scruffy...