CatCapes

With this mod, you can change your in-game cape to anything you want!
Here's how:

If you are online mode:
Log on to the catcapes.jgj52.hu Minecraft server, there, type /token and click the message to copy it! Once you're done, go to ModMenu and set the token setting to what you just copied.

If you are offline mode:
In the config turn off online mode
Then set your cape as usual

Go to https://catcapes.jgj52.hu and upload your cape texture.
You can make theese textures using something like https://skinmc.net/capes/editor.
Then, after you clicked upload you will get a text on the bottom.
Click it, and go to your Minecraft client, open ModMenu, find CatCapes and paste the text in Selected cape.

And you're done!
Others with this mod can see your capes.