There are two ways of making your friends aware of your challenge. The first would be to share your challenge in the feed and tag your friends as well as combynistas you know. Think of a nice little text and highlight the benefits of your challenge to let your friends know what your challenge is about. Just imagine you’re inviting them to you birthday party!
The second possibility would be to create an outfit for your own challenge first and then proceed just like depicted above in the first option. Inviting other users to your challenge is called “nominating.”