It sounds like you've made your decision already (yay for sticking to your guns!).
One of the ways I stick to my budget is by writing out my shopping plan for the future; for example, I'm planning on buying a denim jacket around February of next year. For some people, that's too much planning -- but for my personality, I get a little "hit" by imagining that item is already in my possession (since I know I will stick to the schedule). I don't know whether you've got the same personality as me -- but that's one way I ease the sting of passing up an item.
Completely unrelated: I tried on that particular leather jacket at NAS and passed it up. 21" is quite cropped and, while the seaming helped, it's still quite boxy; the fit was horrible enough on this IT/hourglass that I didn't bother posting pics to YLF. The leather was lightweight and buttery smooth, which unintuitively made me less inclined towards it too: I wanted something with a little more heft.
