What does Spice Girl Geri Halliwell wear to bed? "Oooooh. Not much!" she cooed at the Victoria's Secret fashion show in Los Angeles last week.
Surely a lingerie supermodel wears a pretty slip? "Normally, I wear baggy, flannel PJs," babelicious Czech model Karolina Kurkova revealed.
Despite all the sexy new underthings on display, it became clear at the lacy extravaganza that most people are creatures of habit when it comes to dressing for the boudoir.
"I just wear my tattoos and a smile," said Kat Von D, star of Miami Ink.
"I love everything push-up!" exclaimed model Adriana Lima.
"Nothing," was the to-the-point answer from guitarist Slash.
Seal shared that his gorgeous wife, Heidi Klum, always wears "amazing stuff" - though he refused to divulge the exact nature of her bedtime attire.
For me, variety is the spice when it comes to what to wear (or not!) under the covers. Fancy designer duds are paramount when it comes to getting me through my fashionable life, but I've got a very different stash of garments integral to my style identity that comes out only at night.
A couple of cubbyholes in my closet are devoted to "bed wear" - from playful satin pyjamas in paisley and leopard prints to cozy flannel Nick and Nora ensembles featuring doggie and kitchen appliance motifs. There are also Joe Boxer Girlfriend peacock-print shortie PJs, vintage-style thermals and some groovy lounge wear from a label called Scanty.
Rounding out the mix: enough slinky negligees, silk kimonos and trashy lingerie to satisfy all my entertaining needs. And, of course, on some steamy nights nothing beats going to bed in the buff.
What does it all say about me? That I take my fashion choices seriously - regardless of whether most people will see the garments in question.
Other people's bedroom picks are equally revealing. Sharon Stone once admitted to sleeping in flannel "because I'm single."
Courtney Love used to sleep in Kurt Cobain's pyjamas after he died (how sad).
And Marilyn Monroe famously claimed that the only thing she wore in bed was Chanel No. 5 - when in reality she spent every night in a bra so her breasts wouldn't sag.
My best friend says her most beloved clothing is her nightwear. "I don't have to worry about the way I look in it to the same extent as my day clothes - so there's much more room for comfort and freedom." Her favourite: luxurious, long-sleeved, white cotton nightgowns from Lucca, a swish bedding shop in Toronto.
Sound decadent? One of my swank fashionista friends goes all out. She invested in seriously elegant bedroom gear on a mad shopping spree at Saks a while back. "Winter white silk pants and a cashmere and silk camisole," she boasts. "But the most important part of the ensemble is the wrap, which I team with Christian Louboutin cashmere slippers. It's a floor-length, triple-ply cashmere number with a white mink collar." For her, the bedroom is a place to indulge in luxurious fantasies.
Even though they have less choice, men still play up their personalities with their PJs. "I wear pyjama bottoms with cartoon characters on them," one intellectual guy pal said. "And when I sleep at my farm, I wear nightshirts and long johns." Fitting, considering that Karl Lagerfeld, the brain behind Chanel, sleeps in a white nightdress, Tatler magazine reveals in its December issue.
And, not surprisingly, one of my most eccentric buddies has the most outrageous sleep attire: a "doggie fur coat."
"I just strip down to the taut sinews of naked splendour," he explains, "and call my dog to jump up and lie on me." Cozy or what?
Evidently, when it comes to nightwear - as with daywear - it's all in the mix.