In my school we have a horrible time finding qualified substitute teachers who actually show up, dress appropriately and aren't completely useless.
I'll bite. If you're having trouble finding teachers who show up and aren't completely useless, is it
really appropriate to be worrying about how they dress? Why? Are they turning up wearing nothing at all? If not, this would seem to be something to care about only once you had a choice of really excellent, reliable teachers! [ETA to put it more personally, if I found out that my DS's school, knowing that there was a good chance that the next supply teacher might not turn up or might be completely useless, was nevertheless declining to use again one who had turned up and been OK because they didn't like her dress sense, I'd hit the roof.]
