I think this thread in in the wrong plase so you may find you won't get may answers. So until a moderator move its i'll answer this question.(proberly badly)
You have to think of the jedi along the lines of a religeon more than a social group but less than an army. so they have strict rules that are based on faith.
Are jedi allowed to buy things like hats or t-shirts or a cool pair of shades? I know that the jedi take a vow of poverty or something, but they always have very high tech gear, like a lightsaber and spacecrafts and little doohickeys that allow them to breath underwater. they must get money from somewhere, right? Probably donations. But what if a jedi decided to start some kind of little business, making hemp necklaces or something? Would that be allowed? There doesn't seem to be anything immoral about that.
The jedi as a singular person does not have any personal posseions other than a lightsaber and jedi robes, the robes are the only dress a jedi should ware unless they are in extreame curcumstanses. I think the jedi are pretty much 'funded' by the republic and all buildings and ships are donated to them. The 'doohickeys' are assigned to jedi by the council as they see fit thats why qui'gon has a metachlorine detector with him, the same applies to ships as i got the feeling that obi wans fighter in EP2 was not his. Music is generally based on culture so the jedi proberly have their own jedi music. And pets are for sith lords as i have never heard of a jedi with a pet other than a padawan that i think was han solo son.