depends on where you live, the cost of licenses, and the cost of place your going to sell out of, not to mention the initial cost of your merchandise. for example if you rent space in a mall or a street front store will you be required to pay rent, utilities and whatever decorating or fixtures your going to need.if your on the main drag the cost would be higher than if your on a hard to find dead end street.are you making any of the clothes yourself or buying wholesale?use this calculatorhttp://retail.about.com/library/bl_start��
Your first stop should be visiting The Small Business Administration (http://www.sba.gov/). This site will be your go-to site for understanding what is needed to start your own business. They provide instructions, guidelines and resources to get your business up and running.I know the thought of opening up a fashion retail store may be in its very early stages, but you may want to check out or bookmark this site, http://www.l-trondirect.com/ once you get it up and running. My friend recently opened up a small retail store in town and he was looking for barcode scanners to track his inventory and purchasing point-of-purchase equipment, like those electronic signature pads you find at many stores near the checkout. This site was a huge help when it came to equipping the store to manage the product sold, capturing payment methods of his customers and whatnot. You may find this site useful in time.Best of luck to you!
Check out Entrepreneurs Small Business Magazine. They have start up business manuals and may have one for fashion retail. The books tell you everything you need to know. Before you buy one, visit the local library because they may have one you can sample.