Bikram yoga is literally the specific yoga practice developed by Bikram Choudhury involving about 30 or so specific poses done in a hot room configured in a certain way with mirrors, mats, etc.. Vinyasa is much more general, and can be done in heated or unheated rooms. The common theme in Vinyasa is breath synchronization with the movements and held poses, which is why it is also often referred to as "flow" yoga.
So, between the walking around with martinis in my hand (ability card: walking, alcohol metablization), road cycling, mountain biking, rowing, riding horsies, XC skiing (ability card: aerobic endurance), weight training (ability card: superhuman strength), and the yoga (ability card: deep, focused, sentient breathing), I have the minimum training and background needed to wear both oxford and derby, balmoral and blucher, successfully without keeling over or gasping for air.
This is what DWF is talking about: not everyone can wear shoes.
But how many refills? It's the number of repetitions that really makes this work, you know.