There are so many items of clothing for sale on eBay that you have to think about what you can do to make your listings stand out.
Without seeing your listings, I'm not sure what you've got, so it's hard to be too specific, but hopefully this might give you some ideas :)
The most important thing is to have several very good photos for each listing. Consider buying a shop clothing dummy to put your clothes on in the photographs if you haven't already. Make sure the background is a blank wall or white sheet and read up on photo lighting to try and get a very professional look. Alternatively, use the manufacturer's pictures or pictures from the Macy's catalogue would also be ideal.
Consider spending some money promoting the best looking top - e.g. try bold or even Featured Plus. At the bottom of your listing include a sentence encouraging people to check out your other listings.
$1 NR is also a good promotional tool, even if you just use it on one item, it can help to pull traffic in to click through and view your other listings as well.
Even asterisks either side of your listing title can help get more attention.
If none of those ideas work, then selling small bulk lots is definitely worth a try.
I hope that is of some help - Good luck!