Obama also took off his jacket in the Oval Office — something Presidents Bush #41 & #43 and Ronald Reagan never did. THEY had too much respect for the office.
I believe in a recent interview GWB was actually asked if ever did go into the Oval Office without a tie and jacket and his answer was along the lines that it probably did not wear both 100 per cent of the time. IMHO I would suspect it would have been late at night or the occasional weekend and just a quick pop in and out and certainly not a photo or film clip available.