Many in here confuse two terms: Vegans and Vegetarians.
Vegetarians are defined by not eating meat. The purchase of leather goods etc. is up to personal morale.
Vegans on the other hand, are living by a philosophy that they don't buy, use or consume products which were generated by "exploiting" animals, including, but not limited to meat, leather, milk, honey, wool etc.
I kid you not when I say that one I read a forum thread where vegans discussed if it was okay to swallow after a bj!
So to answer the question of the OP:
For Vegans:
1) Nope
2) Nope
3) Yes
For Vegetarians:
1) Depends
2) Yes
3) Yes
And to the poster above me: The Vegans state that the expoitation started by capturing and breeding animals in a way they need further exploitation to survive, like milking cows or shear sheep.
And a disclaimer: I am neither Vegan nor Vegetarian.