Dress code for Thesis Discussion Is there something like a "standard dress code" for a Ph.D thesis discussion? And, if there is - how important is it? Obviously, one should not (I think) dress too casually, but I do not know what is deemed appropriate.

I don't know how much this varies around the world; if it helps, I am from Europe.
In my experience, different professors can have very different feelings about this. If you have any doubt, best to ask your primary adviser.