I went from operating spacecraft in an AF flight suit to operating spacecraft in shorts and a polo shirt. Until recently, it was perfectly acceptable (for guys, at least) to walk around the office topless. At the request of the Mrs., I have relegated all my jeans (which were the staple of my life at ND) to yard work and carwork attire, in favor of a strict arsenal of khakis. Frankly, I'm better for it.