Boutique

a small shop or a small specialty department within a larger store, especially one that sells fashionable clothes and accessories or a special selection of other merchandise.
any small, exclusive business offering customized service:
Our advertising is handled by a new Madison Avenue boutique.
Informal. a small business, department, etc., specializing in one aspect of a larger industry:
one of Wall Street’s leading research boutiques.
of, designating, or characteristic of a small, exclusive producer or business:
one of California’s best boutique wineries.
Contemporary Examples

Voilà, Le Gap! Choire Sicha September 23, 2009
Designer Champagne Amy Cortese December 28, 2009
Hollywood Mourns Agent Ed Limato Nicole LaPorte July 3, 2010
The Next Great Media War Larry Kramer January 3, 2009
Knox’s Strange Behavior Barbie Latza Nadeau April 6, 2010
My Father Made Jackie’s Pink Suit Michael Horowicz November 20, 2013
Where Were the Doctors to Testify at Roger Clemens’s Perjury Trial? Kent Sepkowitz June 19, 2012

Historical Examples

Evan Harrington, Complete George Meredith
Bohemian Days Geo. Alfred Townsend
First Impressions on a Tour upon the Continent Marianne Baillie

noun
a shop, esp a small one selling fashionable clothes and other items

of or denoting a small specialized producer or business
(as modifier): a boutique winery

a small specialized stall or shopping area within a supermarket, esp selling fresh meat, seafood, etc
n.