At six months I started to go braless more often ie. On a night out. My surgeon said I could go braless at night because unders don’t sag. I started to do this but then went back to wearing my crop top at night as I felt there was a slight change in how they were sitting, when I sleep with a crop top they’re closer together the next day.
I’d say six weeks is very early to go without a bra/support because they would have only just formed and dropped into the breast pocket. In theory I’d think they would need to be held in place for a few months to take shape and not droop/ go further than the pocket made with an underwater bra.
I wouldn’t rush it tbh especially if u have overs as theyre not as supported as unders.