How did white-clothed lay people dress?

How did white-clothed lay people dress in the past? I don’t think t-shirts existed back then. Did they dress similar to monks but in white robes or cloths?

I imagine white robed just meant they were in nice clothes - the way people dress these days when they go out?

Even nowadays, lay people wear white clothes when observing the 8 precepts. I’m just curious as to how lay people from the past dressed because if they wore white robes in a similar manner as monks, I would love to do that too.

I do remember reading somewhere that the clothing style in the past was similar to monks. People would wear robes and leave one shoulder open or something like that.