Can my employer make me were a uniform?

Ok i no it mite sound stupid but Can my employer make me wear a uniform. What it is that i am a tyre fitter in the UK and they have just supplied us with new uniforms and to be honest they used to supplie us with boiler suites but some us wore them and some of us didn't. They never really bothered us wearing them or not . The truth be told the new uniforms make us look like fish mongers and i am sure that i have not signed anything in my contract to say that i wear the uniform. The manager come up to us @ 5.25pm and asked us well basicly told us to wear them 2mro so if sum 1 could shed a bit of light on the matter i would be greatfull