First of all please do Start market research for Sarees, Salwar Kameez, Bridal Lehengas, Mens Wear Kurta-Payjama. Like Research for Market Price, Quality, Best Service & many more ideas. Learn from where raw material comes, how it is manufactured into finished product, how it reaches to market, how product is distributed, what is the margin cost of each vendor in the middle
Then, don't directly jump into it by starting your startup.
You need to do net practice before that. Start Trading Ethnic Clothing. Trading will help to understand what it actually takes to run this business. It'll also help you to create relations between various parties involved in the business, with less risk. Understand what actual market potential involved in the business.
Meet Some B2B Parties Who even do import-Export Business for Ethnic Collection. Right Now many B2B Market Place like Indiamart.com, Tradeindia.com, Indianexporters.com, Exportersindia.com, Doond.com & many more Provide Wholesale service. This all Sites provide payment service for promotion.
Then decide you want to open online retail.
Most startup mean online business only. You can do it in two ways; either sell your products on websites like flipkart, amazon, etc. or you can create your own portal which might involve more troubles.
Money you made from trading can be used as capital for your startup. You can also borrow some money from your family, friends or relatives. Banks also provides loans for starting a business, though i personally don't suggest or prefer you to go with it. If you're still out of cash, than you can search for seed funders who basically fund early stage startups. Mostly, they only fund if you're having your own startup, and not trading on flipkart/amazon. You can show them your passion for ethnic business, your past trading work, your future expansion plans and how they will profit out of investing in your startup. If they're convinced, you'll get your money and they'll take some equity in your startup.