Quoting Aly Grimes:" Because I just was fed up with them at the time. That doesn't make me irrepressible at all. I mean I payed for the uniform."
If you paid for it then it's yours. They can't demand it back. Here they have to supply it to you if it has their logo on it (and you don't have to pay). If it doesn't, then you have to buy it, but you keep it. If you paid for it, then it's yours.
But if it *IS* theirs,then yes, it was irresponsible. You had a responsibility to return their property, even if it was a crappy job, and you failed to do that just because. That is irresponsible.
When did you pay for it and do you have proof?