CatCapes

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

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.

You may need to use /reloadcapes after setting your cape for the first time. Also, if you change your cape the others has to use /reloadcapes too (or restart their client) to see your new cape.