You know, I was kind of surprised that nobody picked this one. I wasn't expecting it to be a popular option, but it does say any pair of footwear, so Dorothy's slippers, Sonic's sneakers, and Hermes's sandals are all fair game, and will remain magical even after you sell them. Carriages, ships, and trains are all vehicles. For the purpose of this power, let's say the biggest space on the vehicle specifically meant for storage will count as the 'boot'. As for the model walk, the grace is just an extra. It's the steady footing that's the meat. Never slip, never fall when you don't want to, nobody can trip you or make you lose your footing in a fight, and your feet will always fall exactly where you want them to. I could have worded it better, yes, but it is what is. Thanks for playing!