Alright, darlings, listen closely because I will only say this once.
No. Capes!
I understand that fabric blowing in the wind like carefree hair is the newest trend, especially with the power that it brings on itself, but there are so many dangers that come with it. (Must I remind everyone of the last tragedy that happened when a superhero decided they were going to stand in front of a giant fan with a cape? Even Carl would've been disappointed by that tragedy and the llama was famous for his giant fans!)
If you want something iconic to finish off your own super suit, there's only one accessory that you need. Anyone keeping up with the latest trends will know that what's needed is a killer pair of shoes. I'm not just talking something comfortable that you can walk around the town in, but something that gives off the "get in my way and I'll make your life miserable" aura (think Kilgrave level fear here.)
Unfortunately, this can't be just any pair of shoes, the only things that can get the desired effect we're looking for is platforms, the bigger the better. Not only will the height increase make you more noticeable towards those around you, but also if you literally step on the toes of your own personal villains, they'll feel the pain that others couldn't inflict on you. If you can tower above the citizens of Hell's Kitchen that you've sworn to protect, then you're doing your superhero duties correctly.
Now, you definitely want to release some of that inner power. If you can't scream from the tops of the buildings, "My name is Tony Stark and I am Iron Man!", then you need a better way to show how powerful you are. A good set of spikes attached to the front of your boots would be the very best way to show that off, each end glinting in the sun like a valuable gemstone will certainly show that you're not a regular citizen to be messed with. This is also another situation of the bigger the better. With long spikes attached to your boots you'll clear out the sidewalk without even trying to, and if a villain jumps out of the nearest trash can, then you'll have a weapon on hand before you rip your shirt off to reveal your supersuit hidden beneath your day-to-day clothing.
I'm certain there's still a couple skeptics out there that can't even begin to fathom the idea of seeing someone walking around in such an empowering set of shoes. Something that you all have to consider is fashion like this has been done before on a more subtle level. High heels allow their wearers to show an inner badass that society has shunned out before on a lower level, and if it can be done then it can be done now.
Of course, you can still let your hair down and allow it to flow freely with the wind because hair is easier to cut away than a cape, plus it'll grow back.
Just remember darlings, stay fashionable.