Various skin packs are missing from the Character Creator. The only way to access them is going to the My Content section in the Marketplace.
Affected skin packs:
4th Birthday Skin Pack
5th Birthday Skin Pack
Battle & Beasts
Legacy Skin Pack
MINECON 2016 Skin Pack
Skin Pack 1 - Classic
Strangers - Biome Settlers 3
probably more
Steps to reproduce:
Go to Dressing Room -> Create Character/Change Character/Change Classic Skin -> Classic Skins.
Scroll down the list and press the Show More button until you've scrolled through all of your skins.
Now go to Marketplace -> My Content.
Search for any of the affected skin packs.
Observed result:
The skin pack is missing from the Character Creator, but is available to use in the My Content section of the Marketplace.
Expected result:
The skin pack is available to use in the Character Creator.
Linked issues
is duplicated by 1
Attachments
Comments 12

Also affects Legacy Skin Pack (and various packs that weren't available to be purchased in recent days).
Edit: For Nintendo Switch, the skinpack from the Super Mario Mash-up pack is also affected (MCPE-187215), and the workaround (steps 3 and 4) from Steps to reproduce won't work for that mash-up pack (until it was made available on Marketplace menu / catalog).
Edit 1: For the Super Mario Mash-up Pack on Nintendo Switch, I have found a workaround to re-equip Mario skins. When Minecraft is opened, go to Dressing Room as soon as the menu pops up, and you'll be taken to the good UI, after some waiting, you can equip skins from Super Mario Mash-up Pack again.
Update 2: Please note working around to the good Dressing Room UI via my method (from Edit 1) can't be performed on Windows or iOS as far as I tested.
Update 3: No longer affects the Super Mario Mash-up Pack as of 1.21.50, but this bug still affects others, including but not limited to Legacy Skin Pack and the rest from the Affected Skin Packs.
I can confirm experiencing the same issue in v1.21.51 with many of the same skin packs. The only way for me to equip one of them - for example - Minecon 2016 - is to go to Marketplace->My library->Skins and view/equip them from there. They never appear in Dressing Room->Classic Skins no matter how many times I click show more.
I can confirm experiencing the same issue in v1.21.51 with many of the same skin packs. The only way for me to equip one of them - for example - Minecon 2016 - is to go to Marketplace->My library->Skins and view/equip them from there. They never appear in Dressing Room->Classic Skins no matter how many times I click show more.
Thank you for your report!
However, this issue has been temporarily resolved as Awaiting Response
Is this still an issue in the latest version?
If it is, please be sure to include list of affected skin packs, that are still available to obtain from marketplace.
This ticket will automatically reopen when you reply.