Content marketing for any sort of content you have, whether it be your new clothing brand, or some other idea is always beneficial!
I have a couple of ideas for you that you may find useful:
In particular, clothing-related content, and marketing around clothing and fashion is huge on Instagram. If you don't have an Instagram account already, I'd sign up for one. We have an amazing blog post specific to market on Instagram:
If you can point me to the exact blog post you're referring to, perhaps I can go into further detail about how content marketing can help you in your specific case :)
I hope that helps to get you started!