Personally I think it's a bit like tailoring your CV for a specific job. If you can, do a bit of homework on the school first. Then pick something suitable to wear. My first job has been at a school near Southampton and the dress code is smart casual which gives a comfortable atmosphere. The club house / office / dispatch point is a nice smart prefab which, whilst cosy, is small. There wouldn't be room for jutting epaulettes and caps in there....
