The hotel souvenir has grown up. What started with Westin selling its Heavenly Bed through Nordstrom in 1999 has turned into a proper luxury trend: suites designed so you can buy what's inside them, from menswear capsules to the art on the walls.

The most polished example is at The St. Regis Chicago, which has teamed up with British menswear label Drake's. Book the Drake's for St. Regis package and you'll find a four-piece capsule waiting in your room — a necktie, pocket square, baseball cap and silk-blend bandana. It's a smarter keepsake than a branded pen, and for travellers with packed schedules it doubles as retail therapy without leaving the suite.

Out in Beverly Hills, L'Ermitage has gone bridal. The hotel hosts Vera Wang's only West Coast bridal salon, and its new Vera Wang Bridal Suite wraps a gown-hunting trip into a full stay: couture-inspired details, the designer's signature fragrance, luxury linens, keepsakes, plus cocktails and champagne. General manager Frederic Zemmour positions it as a place where couture and hospitality meet — brides can bring family or friends, prepare at leisure and celebrate after the fitting, instead of squeezing an appointment between lunch and a flight.

Furniture and art are the other big draw. In Copenhagen, The Darling — three apartments in an 18th-century building founded by Jens Løkke and Uffe Buchard — came about precisely because guests kept falling for hotel pieces with no way to buy them. Here everything is for sale: Finn Juhl furniture, Louis Poulsen lighting, even the custom kitchens. Art rotates constantly thanks to partnerships with Copenhagen galleries and over 60 local artists, and a piece sells roughly every third day, so no two visits look the same.

Athens offers a grittier take at Mona, a hotel in a former textiles factory in Psirri. Designed by Greek studio House of Shila, it pairs peeling paint and exposed steel with bespoke furnishings, antiques and local art — nearly all of it purchasable, from custom-knit rugs and gauze curtains to organic cotton sheets and jewellery by Athens label Hermina. The setup doubles as a showcase for the city's makers.

Stateside, Piaule, a 50-acre retreat in New York's Catskills, furnishes its cabins with Design Within Reach pieces, a selection of which can be ordered through the retailer after your stay.

The appeal is obvious. You've already lived with the chair, the lamp, the artwork — you know how it looks in real light, next to real furniture. That beats guessing from a catalogue. And it sidesteps the classic holiday letdown of buying something you never actually use. Not every stay needs to end with a shopping bag, but if a sculptural chair or a Vera Wang fitting is what you'll remember, a growing handful of hotels will happily let you take the memory home in a more literal sense.