Tabards great idea - our pre-school wear them and can have all manner of things in the pockets - including that all important post-it note and pen for the odd observation
Means you can swap them between staff also, and yes, great for covering up when 'more than a sensible amount of flesh' is on show! Quote is from an email from DH work in summer when some of the younger staff were baring a bit too much!
Tabards easy to make if you know someone with a decent sewing machine??
Either way you could get them screen printed at t-shirt printing shop? Cheaper than embroidering?
Don't NCMA do tabards, though think they about £15 each....