This fall/winter, showing a little skin when it gets cold is easier than you think. No, we're not talking the usual thigh-skimming hemlines or sheer underpinnings that require additional layers or steps to keeping warm. Lucky for us, keyhole slits at the centre of the chest reveals just a hint of skin for a subtly sexy effect. 

FW15 Micro Trend Keyhole Slits - Altuzarra

Fall Winter 2015 Micro Trend Keyhole Slits Barbara Bui

Fall Winter 2015 Micro Trend Keyhole Slits Sonia Rykiel