November sales have started in most of the clothing shops; sales are a dream for the thrifty shopper, but can end up being dangerous for your bank account - those half-price shoes and seventy-percent-off tops may end up costing you more than you thought. Major discounts often lead to impulse buys and a frenzied shopping experience for even the smartest shopper. To help combat this, there are things you need to do before you even leave your house.You do not necessarily need to clean out your wardrobe, but a quick inventory of what you already have is essential. Not only do you figure out what you need to buy, but it will also give you an idea of the type of items you may purchase often but never wear. Making a list will help you stay on track if you refer back to it while shopping. It is easy to become distracted.Have you got the basics? A couple of stable items will not go astray in your wardrobe. Whatever kind of personal style you have, a good pair of shoes/runners is a must. Spend a little extra and they should last you years. Stock up on other basic items such as t-shirts, jumpers etc. - anything you know you will definitely wear time and time again. If you have a certain style of item that you love, try to pick up something similar.Knowing your own personal style is key here. You will be able to search more efficiently, saving you both time and money.Remember to try everything on. High street shops are notorious for their varied sizing. Not only are the sizes different from shop to shop, but they can also be different within the one shop, especially when it comes to jeans, as it is difficult to find the perfect pair at the best of times. If you’re unsure of something, leave it.Some shops do not accept returns on sale goods. Five euro may not seem like a lot, but if you never wear it, it is a waste.You don’t have to commit to the first shop you come to. Make a note of what you like, even take a quick picture of it. A different shop may have a similar item cheaper, or one you may prefer.It is also advisable to look in shops you wouldn’t normally consider going into. You could surprise yourself. Also worth checking out are more expensive clothing shops: the sale items may be slightly more expensive, but of a higher quality (although this is not always the case!)Certain stores are synonymous with different aspects of fashion; River island have great jeans. H&M offer great basics. Some shops cater for a variety of sizes. New Look, for example, carry petite, tall and plus-size ranges.Sales are exciting, but don’t buy something just because it is on sale. It is not fun to find it hidden away, never worn, three months from now.