For the exotic armour, not all ornaments will show up only some of them do or if you have the ornament already unlocked. This is the same for some guns however not as a bad and you can see gun ornaments in your collections regardless. As for the legendary sets, what armour and you trying to find the ornament for? not all armour sets are in transmog and if you are already wearing that set it wont appear either.
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Almost every single one of my Titan exotic ornaments are missing both the ones purchased for silver and the ones purchased with bright dust. They don't even show up for me to apply and it's treating them like I've not purchased them
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Check in your “consumables” tab, when buying ornaments for eververse they go there first incase you mistakenly purchased it and want to refund them.
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I purchased some of these years ago, and I know to check there when they're purchased. They're missing
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Ok if you're 100% certain they are missing then use the following link below to contact Bungie regarding you missing purchases. https://help.bungie.net/hc/en-us/articles/360049497351-Contact-Form-Missing-Eververse-Item-or-Add-On-Items