I completely agree that if a monthly budget gets stuck as only "per month" spending it will be hard to take the long view. This assumes that for most people the monthly budget in principle will be less than the largest, large-ticket item that you might conceivably buy, e.g. monthly budget is $200 but you would consider a $600 winter coat (or substitute any similar arithmetic).
So it's important to be able to imagine both the potential items that might be useful in the wardrobe, and the "usual" or likely costs of items and think fluidly--month, quarter, year-- about how those might be reconciled--save up lots, save up some for sale price, or find an especial bargain such as e-bay or thrift gem.
I'm still working on all of this, so I enjoy your line of questioning. It's not so much that I need to think how to save up for a Burberry coat--but it's similar, in that I still need to think, what actual item or items make my wardrobe and dressing easy, fun, stylish, and if I can identify those, what items am I buyiing instead, and why, if I could be buying the others? Is it because I don't find them and am impatient and buy "substitute gratification"? Or is it that some of the items are relatively expensive?
Right now I think it is more of the former--lack of really identifying any specific useful or "happy 10" item and being able to recognize it. But, your question fits in, because it would mean that we should be more alert to having times of "not buying", not just because we're saving up for a specific item, but because there is not something we really super-love/need and if not, then we haven't added something unnecessary and we will still have the $$ available when something turns up.