I'll join the crowd with a wide forefoot and narrow heel that can't keep pumps or ballet flats on. I also have low/no arches, i.e., a low volume foot so buying wide width shoes is not a complete solution but adding an arch or heel orthotic sometimes helps. In addition to bunions, I also have hallux rigidus on one foot, so that means low heeled shoes that don't flex. Just about any shoe is difficult for me to get a fit.
Tall boots are probably the most difficult because in addition to the issues above, I'm short so I need a 13 to 14" height and I have very muscular calves but relatively small ankles. I've given up on tall boots, but I don't really need them anyway because I live in California.
Sandals are probably the easiest because they may be adjustable at the forefoot, over the arch, and at the heel. Unfortunately, I have Raynaud's Syndrome in my toes as well as my fingers so they tend to turn purple if it is under 70 degrees.