Tag not monitored by Microsoft.
Hey there, Aleks
As this relates to Minecraft, and in game content. Please can you reach out to Minecraft support through this link: https://help.minecraft.net/hc/en-us/request/new?ticket_form_id=360001225811
This will allow you to reach out to Minecraft support where they can look into what has happened with your missing cape.
As this question is not supported in this community, I am going to change the tag on this question to not monitored.
Hope you get this resolved,
Nathan