John is right, for the most part this stuff is personal preference. For boots, it depends on what you will be doing and what you are comfortable with. I believe several guys on here wear logger boots, while others wear boots with much smaller heels. As far as pants go, it depends on how much you want to spend on them. I just bought myself a few pairs of Arborwear pants (very comfortable & durable) but they are pricey. You can use blue jeans, or Carhartt pants, or whatever, however I don't recommend that you wear shorts. Ropes are again, what do you like... do you want the 12, or 16 strand? What colors do you want? What characteristics do you want? For spurs (used on removals or dead trees only) that is again a matter of preference. You can get them with offset gaffs, or non-offset gaffs, you can choose from a whole array of leg pads to use with them. The snaps you use are up to you (so long as they are approved by ANSI for what you do. The saddle you use is the same thing. I would suggest to you that you visit several arborist supply stores and check out everything that they have.