If you are not certain how to differentiate between a fashion boutique and a clothing store, don't worry.  Not many people do understand the difference (if their is one).  From the links below, you will find clothing stores and clothing store directories.  Hopefully, this will help you find retailers that are offering designer fashion.

Clothing Stores - you can find numerous apparel store options from the clothing stores directory section on the Apparel Search directory.  They are organized by category, location, and by name.

Apparel Retailer - this website provides a method to search for retailers by using a search engine.

Neiman Marcus - For over a century, The Neiman Marcus Group has stayed focused on serving the unique needs of the luxury market. Today, that commitment is stronger than ever. They have stayed true to the principles of their founders – to be recognized as the premier luxury retailer dedicated to providing their customers with distinctive merchandise and superior service. The Neiman Marcus Group is comprised of the Specialty Retail Stores division - which includes Neiman Marcus Stores and Bergdorf Goodman - and the Direct Marketing division, Neiman Marcus Direct. These renowned retailers offer upscale assortments of apparel, accessories, jewelry, beauty and decorative home products to the affluent consumer.

Bloomingdales - Bloomingdale's is committed to lead the way with exclusive merchandise, customized services, and alternative shopping venues. Carrying on the Bloomingdale's brothers' dream, they are always finding ways to set their stores apart. That's both the legacy and the promise of Bloomingdale's.

Bergdorf Goodman - Edwin Goodman worked for Herman Bergdorf in his tailoring establishment just above Union Square in downtown Manhattan. Then in 1906 Goodman purchases the store from Bergdorf and moves to the site where Rockefeller Center now stands. In 1914 Goodman is the first couturier to introduce ready-to-wear, making Bergdorf Goodman the destination for premier American and French fashion.

Lord & Taylor - Since 1826, Lord & Taylor has built a reputation for service, for quality, and most of all, for style. By creating a unique mix of the latest trends and the timeless classics, they have become the favorite store of generations of shoppers. The windows of their flagship location on Fifth Avenue have been making an impact on the New York fashion scene for more than 90 years and that influence is only going to spread as they continually expand and improve lordandtaylor.com.

Nordstrom - Nordstrom, Inc. is one of the nation's leading fashion specialty retailers. Founded in 1901 as a shoe store in Seattle. In 2012, Nordstrom operates 226 stores in 30 states, including 117 full-line stores, 105 Nordstrom Racks, two Jeffrey boutiques, one treasure&bond store and one clearance store. Nordstrom also serves customers through Nordstrom.com and through its catalogs. Additionally, the Company operates in the online private sale marketplace through its subsidiary HauteLook. Nordstrom, Inc.'s common stock is publicly traded on the NYSE under the symbol JWN.

Dillard's - William Dillard, the founder and Chairman of Dillard’s, Inc., developed a keen interest in retailing at an early age. He started his success story in 1938 when, with $8,000 borrowed from his father, he opened a small store in his wife's hometown of Nashville, Arkansas. By that time, he had better than 12 years of part-time and summer experience working in his father's Mineral Springs, Arkansas store. After completing college (University of Arkansas-1935) and graduate school (Columbia University School of Business-1937), Mr. Dillard began working as a management trainee for Sears Roebuck & Company. Shortly after completing the training course, a period of only seven months, Mr. Dillard left Sears and opened his first store.

Belk - In 1888, 24-year-old William Henry Belk opened his first store in Monroe, N.C. He had $750 in savings, a $500 loan, and $3,000 worth of goods taken on consignment. He thought an impressive name was a must, so he named his store the NEW YORK RACKET STORE. His philosophy for the store was that, "A bargain leaves both the buyer and the seller feeling good." Also, he believed that "A customer may not always be right, but he always has rights." Possibly most important, he felt that "A one-trade customer won’t help much. You’ve got to keep them coming back." Today, Belk occupies 29 million feet of retail space, all with the single goal of satisfying the modern Southern lifestyle.

Gap - The Gap was founded in 1969, with a single store in San Francisco. They are a specialty retailer offering clothing, accessories and personal care products for men, women, children and babies. With more than 134,000 employees and about 3,100 company-operated stores and about 200 franchise stores (2012), their presence is felt around the world.

Express - Express is a specialty apparel and accessories retailer of women's and men's merchandise, targeting the 20 to 30 year old customer. The Company has over 30 years of experience offering a distinct combination of fashion and quality for multiple lifestyle occasions at an attractive value addressing fashion needs across work, casual, jeanswear, and going-out occasions. The Company currently operates more than 600 retail stores, located primarily in high-traffic shopping malls, lifestyle centers, and street locations across the United States, Canada and Puerto Rico; and also distributes its products through the Company's e-commerce website.

Wet Seal - Headquartered in Foothill Ranch, California, The Wet Seal, Inc. is a leading specialty retailer of fashionable and contemporary apparel and accessory items. As of June 30, 2012, the Company operated a total of 553 stores in 47 states and Puerto Rico, including 470 Wet Seal stores and 83 Arden B stores.

Sure, their are many more clothing stores.  However, we could not list them all on this page.  If you are interested in find more apparel retailers, you can use the ApparelRetailer.com search engine.  That engine will search the internet.

You can learn about additional clothing stores and boutiques from the fashion scales at the Plus Dragon website.
 

Designer Fashion Boutique Guide