Well, looks like it's quittin' time. Give up alternative fashion forever.
I'M KIDDING. FORGET YOUR MOM. WEAR IT ANYWAY WITH TRIUMPH.
Tell your mom it makes you happy, and it's how you want to look. If your mom is that stubborn, and won't let you leave the house that way, pack your outfit in a bag and change in a bathroom somewhere. We all make these sacrifices for what we love, and if you're truly passionate about your style you'll make them, too.
Anyway, no one here is actually going to tell you to stop wearing what you like. You're on a website dedicated to Asian fashion.