Twofold for me. I'm pretty apathetic in general, but when it comes to self appearance, I'm really, really self conscious. I don't know why, but it goes as far as how awkward I feel when I'm swinging my arms and how other people view me when I'm walking, or the position of my arms on the steering wheel when I'm driving my Jeep, especially doorless, etc. Clothing wise I'll generally throw on whatever is clean, and don't really care about matching or aesthetics.
When I'm backpacking, it's the complete opposite. I don't care how I walk, but I prefer certain colors and clothing styles. I love my gecko green Houdini and wearing shorts and my OCD keeps my pack in check. I get annoyed that the top of my pack isn't rolled neatly/evenly, etc.
Missing my leopard gone wrong (lime) DGGs.
Colder trip, nothing hanging off my pack.