Instagram, with it's highly visual nature, is probably more suited to sharing fashion images than Twitter. Twitter tends to reward info, tips, advice that is somewhat newsworthy or timely.
Having said that, there are obviously some big fashion brands that do well on Twitter.
Here's what I recommend...
Take some time to think about your brand's ideal customer. Write down who they are. Why on earth would they be interested in your fashion images? The reality is, they don't know you and they don't care you right now. And they probably don't care for an endless stream of images of people wearing tight leather clothing. Your job is to understand who your ideal customer/s are and what they care about. Only then will you be capable of engaging them on Twitter.
Research other fashion brands on Twitter that you want to emulate. What are they doing that you're not? I guarantee there will be substantial differences between your account/s and the ones you'd like to emulate. And I bet these accounts have a pretty darned good idea who their target customer/s are. Note each difference, write it down, and then devise a plan to narrow the gap.
As I previously indicated, make sure every element of your Twitter account reflects positively on your brand (header, logo, images). The better consumer brands follow a consistent theme across all of their social collateral. Their audience can often recognise them in their (crowded) Twitter feed just from the graphics they use.
If you understand your ideal customer, it's highly likely they're interested in a variety of content, and not just a never-ending stream of images of men in leather underwear. So, give them a variety of content. What news might your ideal customer be interested in? Would branded happiness quotes make them happy? Would short videos brighten up their day? If they're into leather, would pictures of half naked men drooling over sports cars do it for them? (These are questions you need to answer by understanding your ideal customer). The key is... variety. Branded variety.
Ask yourself whether having hundreds of small twitter satellite accounts is really helping. Unless they're also delivering value (to someone, even you) then they're just noise. And if they're crap accounts with low engagement then they'll never be noisy enough to be heard above your big brand competitors.
MP is a fantastic tool. It enables you to manage shitloads of accounts. That doesn't mean you should. The tools also works brilliantly for managing and growing a small number of high quality accounts.
One well branded, thoughtfully curated, engaged Twitter account is worth infinitely more than thousands of never off, constantly posting, minimal engagement, obviously botted, spam accounts.
Unfortunately, hard work is involved. The beauty of MP is that, once you've got a robust strategy in place, it takes care of some of the drudgery of managing campaigns. But the tool, even though it's phenomenal, can't do the thinking for you.
Best of luck