Is it the visually ravishing vistas of fabulously frocked and jewelled women, or the vicarious pleasure of watching ubridled consumption of cigarettes and whisky that makes US series Mad Men, so compellingly viewable? Whatever the answer - and I suspect it will vary depending on your gender and your age - the BBC4 series, has led to a late-50s/early 1960s fashion revival that, frankly, seemed unthinkable even five years ago.
It's that time of year when clothes in dark colours and heavier textures send us rushing for the new shades and products that will transform us from pallid zombies to winter glamazons.
At this time of year, as the light starts changing, the make-up we've been wearing all summer starts to look wrong. The advice from leading make-up artist Carol Morley when planning your look for autumn is to keep it simple and put the emphasis on one feature - eyes, lips or cheeks -but definitely not all three.
Considering how irredeemably off-trend skirts were last winter - apart, of course, from the pencil skirt which has become a wardrobe classic - it is astonishing (or would be anywhere apart from the capricious world of fashion) that this year a skirt is one of the most sought-after garments.
This is partly down to the novelty factor. We have grown nostalgic for them, having worn mainly dresses and trousers for the past two winters.
It has been half a decade since Jaeger began its regeneration under boss Harold Tillman and in that time it has been transformed from a stodgy heritage brand, bought primarily by county types in pearls and Hunter wellies, to Jaeger London, a dazzling, iconic and perfectly on-trend British fashion label.