Although it's very easy to fall foul to the habit of buying items simply because they are "in fashion", it's not always the best idea. There are two main problems: buying according to trends can incur debts rapidly and just because a piece is fashion forward doesn't mean it will suit all body shapes. Purchasing investment pieces is best as these will stand the test of time. Each week we will introduce a new piece for your wardrobe and provide three options from where to purchase it, catering for all budgets. As every woman knows the little black dress is a style essential and the perfect item to begin with. Steal - €15 at Penneys As every woman knows, you can't beat a good Penneys bargain. This is the ultimate style steal at the brilliant price of €15 and it's the type of dress which can be recycled for different events by adding accessories. A beaded collar, statement cuff, colour pop clutch bag... the list is endless. Splash - €40 at River Island Slip dresses are very hot right now and while we urge caution when buying into trends, this piece can be easily changed to suit different looks. Pair it with simple stilettos heels for this season but when the slip dress fad dies down, slip a cosy knit on top and you have a pencil skirt. Chic casual style, sorted. Splurge - €179 at Lennon Courtney at Arnotts. Yes, we know that price tag is a little scary but this is a sartorial staple that you can still wear ten years down the line. It's the type of dress that looks good at any time of year: wear with flats to the office or statement heels to an important event. Not only that, the steep cost is justified by the beautiful fit and impeccable tailoring.