This Monday's TEFL Prague tip is...
Remember that you never get a second chance at a first impression.
Whenever you have a new class of students always dress up super-smart for that first class.
For subsequent classes you can wear smart casual as teaching in Prague is much less formal than some other destinations, but having dressed up super-smart that first class will have made a lasting impression and will have immediately distinguished yourself from some other teachers who might view teaching as a way to fund a few month's party time in Prague and who might dress accordingly. Dressing super-smart that first class will establish yourself as being a professional teacher and someone who needs to be taken seriously.
Hope it helps!
Hezky den!/Lovely day!