Re: well...
I don't think I've ever seen anyone in an RH office in a dressing gown :) It's maybe not shirt sleeves for engineers, but at least a clean t-shirt...in general the RH culture has always been a bit more buttoned-down than a Valley company would maybe be.
About 25 years ago I was asked to run a Unix internals class for a group of IBM lab engineers who were working on bringing some of mainframe land into the Unix age. No doubt influanced by things like DPM's Diary (this was before El'Reg existed even as a news letter) I was expecting the blue suits, white shirts and blue ties. But like lab engineers the world over, this wasn't their look. The manager arrived on the first morning in an Iron Maiden tee shirt and their wasn't a corporate clone in the team.