It was a late night in the sciences lab on board the USS Enterprise. The Captain said he needed a cure for the virox plague on Cor Caroli V, so that meant every scientist on the ship was hunched over a scanner. All night, your forehead was pressed into the scanner hood until your eyes burned.
Those late night sessions always made for difficult morning shifts, and at 0800 you have to be up-and-at-em at your post. You roll out of your bunk and plod over to the foodslot for your morning coffee. Too tired to even put on your uniform, you hope nobody will mind that you're wearing your Starfleet issue bathrobe.
I mean, it looks like a uniform, from a distance - they're the same color as your sciences department top, or command-gold if that was your department. They have your department insignia on the left breast, and even your rank embroidered on the sleeve. As long as you stay casual and relaxed (easy to do in this warm and soft terrycloth bathrobe), nobody will notice anything's amiss.
You step up to the food slot, insert your bright red data tape, watch the blinkenlights for a moment, and out pops a steaming hot cup of Ethiopian Sidamo. Armed with your stimulant, it's back to the sonic showers before you join Alpha shift on the bridge. Those buttons aren't going to press themselves.