My first job I was an outdoor tour guide at a tourist railroad - my uniform was basically the Main Street vehicles / railroad uniform. The vest was optional in the summer but I always wore it - it never made a big difference to me.
Fun fact - the original black vests at Disney had custom gold buttons with the castle engraved on them. Likewise the Plaid vests for guest relations had the “Disney cursive D” engraved on them. I love little details like that. Wonder if the new uniforms have and such details