no instant buying. you need umbrella? check auction sites first!
also, i don't buy anything that doesn't seem to be of great quality. i had many umbrellas, but one that was bought at solid price, is of great quality, and is very beautiful is not going to be forgotten in cafe, or at friends place, like many, many other before...
same goes for clothes. i go through whole wardrobe at least every three months, and put aside things i don't really wear (or for some reason don't like so much anymore). for every thing i decide what to do with it; give it to sister, friend, mom, sell... . great thing to do is to organize a
clothes swap party with your friends, after cleaning your wardrobe, and before going to the shopping.
food.
the less processed food you buy the more you save, and better food you get. avoid buying ready made cookies, juices, microwave lunches etc. when you make your cookies or juice you can make them to your taste, and healthier. imagine all the preservatives they have to put in those things, also how many nutritional ingredients disappeared, by the time you eat or drink them.
try writing down all your expenses through at least one month, and i'm sure you're going to figure out what has to be changed, because there's no unique recipe. something that could be good advice to me, could be completely useless to you.