Original post by KevinLongeWhilst it certainly is true that more sales can lead to more money, it can be a very difficult game to play. Competing solely on price rather than quality can become a bit of a nuisance, as bigger companies will typically always find it easier to lower prices than you can, unless you charge insanely lower prices, in which case it would porbably be very difficult to make money. Arguably, it would maybe make more sense to go for some sort of niche that is being provided so well for atm, and then once you have satisfied that niche really well, you can begin to expand into other things. For example, maybe you could offer services to youtubers, snapchatters, instagrammers etc.. to start up their own designer lines, or something along those lines. Or, if you just wanted to have your own design line, what I would do is make a youtube channel (and of course have a snapchat and instagram as well) and post videos and tips on something related to design that you think you can help with (e.g. how to make your own clothes at home, how to deal through problems being a creative person, or maybe something that is slanted a bit more away from clothing, but is somewhat relevant enough that you could still mention it occasionally).
As far as the amount of money you would need to start this goes, it would depend on your ability to do most of the stuff yourself. If you are capable of making most of the designs yourself, then that will cut down more of the financial cost, as more of it will just be translated into effort and time you put in. If you are simply going to purchase 'designer' clothes from other brands and resell them, my advice would be to look for very small niche brands (some very small ones, and I mean very small, off of google searches and maybe some youtubers, instagrammers etc...). How much this would cost, would depend on how much inventory / stock you are planning to hold. Ideally, you would want to minimise this as much as you could, or only ensure that you actually order stock (from the small designer) once you have gotten and order from a customer (this way it reduces the financial risk potentially).
In this day and age, to would be ideal to start the business as a website, of course, as that will massively cut down costs, and reduce the risk massively.
If you have any more questions, I will try to answer them to the best of my ability (I am still new to exploring business related stuff myself haha). It's very nice to see someone else who is considering going down the route of business, as I feel there isn't many of us lol. Hope that helps anyway.