Rules for Shopping

So me and my friend were shopping, and she asked me are there rules for shopping? She was very serious about this and that got me thinking, is there really rules for shopping? I know i have my rules but is there like offical rules. I googled it but nothing come up. So here are my top 5 offical rules for shopping(in no particular order).......... 1. Only buy what you love, if it is o.k. don't buy it them but wait and if it is still on your mind by the end of your shopping buy it!
2. If it does fit right, don't get. Seriously sticking it in the dryer a few times before wearing it while does no good for you, the enviroment and your shirt.
3. Always try stuff on. Seriously, you can waste a lot of money.
4. Never buying something just because it is on sale. Is it better to have only a few great shirts that you love than 100 tee shirt that you only bought because it is on sale.
5.Never shop solo. Who is going to tell you that your butt looks really big in those jeans? Because a great outfit can make you forget about that big butt.

So what are your rules? I might make a new list of what blogger's rules are. So give me some so i can make a new list.