I can perhaps offer some advice, as I sell vintage garments on occasion. I agree completely with 'brande' -- find a better place than eBay to buy your stock. It's probably the worst source you can use.
I'm not saying that you can't occasionally get a good item at a reasonable price that turns out to be easy to repair and resell, but there is generally far too much outlay, too much time and too many issues involved in sourcing individual items on eBay. You must also factor in the time you spend actually repairing, photographing and listing your items. Remember that the seller from whom you purchase is also trying to make a profit on eBay, so his/her profit is already part of your cost.
Instead, if you live anywhere near a city, make thrift stores your regular haunt, keep informed on what local auction houses are offering and place reserve bids on lots of clothing that might come up. Many auction houses that specialize in furniture and collectibles basically just dump used clothing for whatever bid they can get. Watch particularly for estate sales, which (at least in Canada) often comprise the entire contents of a person's home, including clothing.
You may find 3 or 4 good treasures in a $10 lot that are of interest and are worth repairing and reselling, and you can always give the rest to charities, or throw away whatever can't be salvaged. One of the best lots I ever purchased at an auction house was a bunch of clothing tossed in a box that no one else was interested in. I got it for under $20 on a reserve bid, and it turned out to contained 5 wonderful 1950's dresses that were in excellent condition.
If you have museums or historical societies in your vicinity, you may want to connect with the textile or costume collections staff. Very often such institutions will receive far more in the way of vintage clothing gifts than they can properly store or display. And they frequently de-accession items. Of course, you would have to pay for most such items, but they can often be of very high quality and of real value. If you can build a relationship with a particular museum or historical society, they may give you first option on such items.
There are other sources if you look for them: put out the word to friends and relatives that they give you a call before discarding any piece of valuable clothing, put an ad in your local paper, find out whether any local department store(s) will sell off last season's fashions at a discount, etc. etc.
All that being said, selling vintage clothing can be a challenge, and is indeed an art. You are also going to find there are a lot of fierce competitors out to get at the same source stock as you. I've seen this in action -- internet dealers scrambling over each other to grab juicy items just being put out in an upper-crust neighbourhood thrift store.
To be successful selling vintage clothing on eBay you must have outstanding photographs (and lots of them, including close-ups), and very clear and comprehensive descriptions that generate excitement. Never, ever, rely only on stated size numbers - always measure each garment for the 5 or 6 most important points and put those measurements in your listings, in inches and centimetres. Describe colour very accurately, and remind buyers in your listings that monitors can display colours differently.
Keep in mind that clothing is a land-mine for subjective customer issues, especially when you're selling over the internet: doesn't quite fit, colour isn't quite right, too long, too short, etc., so the more specific information you can provide, the better.
On the plus side, it's true that few people have sewing skills anymore, and anyone who is capable of making or repairing a garment properly can do well and be in demand. By the way, don't forget that those same skills can be very much in demand in the "real" world. I had a friend who was making $30 per hour doing clothing alterations and repairs locally. You'd be surprised how many people these days will even pay someone to sew on a button!
Best of luck to you, and by all means come back to these boards if you need some specific help or pointers. And do find other places to buy your stock for reselling besides eBay!
Cheers.
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