I am not sure if you are complaining about exporting to FBX and returning it back to CC, or about importing FBX to a third party app.
It's not clear where the screenshot came from.
In first scenario, go with what Peter suggested. You have to use hide body mesh tool every time you return FBX back to CC.
Otherwise use "Delete Hidden Mesh" on FBX export panel if planning to permanently export clothed character out.
All hidden body mesh would be deleted and you will not get those pocks though.
(Note: you will not be able to return it back to CC though if you checked that box on export).
If you do NOT wish to delete a hidden mesh on export (for whatever reason) but still retain a perfect fit in third party app,
you have to use "Show All" option in Hide Body mesh toot for the item of cloth and then work out body pock through with Skin Weight, Conform and Mesh Edit tools.
This is not an easy process sometimes and requires to be patient and very thorough with various poses.