That's right. I've seen it too. But the product is always something new, interesting, unique or extremely useful that's not easy to buy at the local stores.
No. "More" is not always "Better". A store with a single fantastic interesting product or a store with 50 fantastic interesting products will do much better than a store with THOUSANDS of CRAPPY BORING and/or easy to get locally products. That's just common sense.
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But there is one member on this forum who the opposite view. He thinks having thousands of crap products is good ... but he's retarded ... lol )
I suggest you get interesting and/or more unique products that are not easy to get at local stores. Clothing is easy to get anywhere and is not special. And there are tens of thousands of others selling clothing too.
You need a "niche" dedicated to a particular thing. Something that people are passionate about. And people are passionate about LOTS of different things. Like "Dragons" I mentioned above and HEAPS of other things.
Run of the mill clothing is pretty boring. People don't form Facebook Groups based on normal run of the mill clothing. They may form groups based on "specialised" clothing like Goth clothes or Cosplay costumes though. And those are examples of specialised niches too (Goth and Cosplay)
Find a specialised thing large numbers of people like (dragons, cosplay, Goth, Labradors, Poodles, vampires, unicorns, colour-in books, macrame the list is endless! Then type the niche into Google Trends and see if the interest graph is steady or going up. Then Google the niche and see how much competition there is. Then search Aliexpress to see if there are enough products related to it available.
There are also a few blogs on all this in the Alidropship Blogs. Or simply Google ... "How to find a drop shipping niche"