If you're buying underwear for a woman, being in possession of a best lingerie brands A-Z is second to something altogether more important: knowing what sizes she wears. A basic understanding of lingerie is as important a subject for men who date women as how to buy flowers and how to choose perfume. For the purposes of this edit, I (senior commerce writer and gift guide expert Jessie Atkinson) have asked the many women working in the office to tell me which lingerie brands are their favourite, and why.