We have been running a series over the last couple of months on the style staples that every woman should aim to invest in. From the black blazer to a white shirt, tan tote bag to printed pants, maxi dress, brogues and midi-length full skirts to name but a few…we have it covered. This week it's sunglasses and we have put together three options: the first is priced at €3, our second option is €20 and you can bag the third for €170. €3, at Penneys. Sunglasses are a summer essential. Actually, scratch that they're handy to have all year round. If you're suffering after a Saturday night out, then these are ideal for hiding tired eyes and dark circles. Considering they're only €3, you'd be mad not to snap them up! €20, at River Island. These are a style STEAL at €20. Black goes with everything, the gold detail adds a glamorous touch and cat eyes frames channel retro cool. You might be dressed in your baggy boyfriend jeans and a simple white vest but these will instantly give you a sophisticated swagger. Ray Bans, €170 at Brown Thomas. Aviators are the ultimate in classic chic and while these are on the pricey side, they're an investment. The mirrored shades ensure they stand out and Ray Bans are instantly recognisable. While there are multiple knock-off versions readily available, there's nothing quite like the real deal.