brighton bus driver's uniform (Round Hill BN2)

I'm the art lead at a local nursery and the kids have recently been doing a project about buses. I was hoping perhaps that if I can find an old/spare local bus driver's uniform I can modify it into a dress up costume for the kids. I did contact brighton and hove buses directly but they just told me to buy a generic costume - but I think it could be fantastic for the kids to have a costume that actually looks like the actual bus drivers they see in their city