While the Founders Cape (the only cape I have) works perfectly with Custom characters and skins from skin packs, the custom import skins don't display the cape, despite being equipped.
I for one hope that this is only a minor glitch and not an intended feature.
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Thank you for your report!
We're already tracking this issue at MCPE-54439, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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Changed to a duplicate of MCPE-53513 (cape) instead of 54439 (elytra).

Changed to a duplicate of MCPE-53513 (cape) instead of 54439 (elytra).
Thank you for your report!
We're already tracking this issue at MCPE-54439, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki