White jackets are an absolute staple of my wardrobe in spring and summer (I have one very cropped one, and one not as cropped). I wear my them all the time without necessarily having any other white in my outfit.
Of course, as cinnamon fern said, when I'm wearing a dress they're always bookended by my pasty-white legs!
:-O
I probably wouldn't wear a white denim jacket with white jeans. I wouldn't say it *couldn't* be done, but it would be tricky. Jonesy's examples are great for white-on-white looks.