Between the mountains

Imagine if you can a woman, middle thirties, slim, with long reddish-brown hair. She's wearing a smart, navy blue suit, white cotton blouse and a scarf that shimmers in shades of grey and silver. She holds herself well, like a fashion model, or an actress, or one of those fifties finishing school girls. Good looking? I think so, but how about this: you've seen this woman before. She was in the post office queue this morning, or you caught a glimpse of her across a crowded coffee shop somewhere months ago, or was it browsing the clothing section of Marks and Sparks last weekend?