I've started having the same problem few days ago... My Honor Guard Type 3 outfit stopped working and the tailor doesn't show me the associated costume options anymore. Taking off and back on my Honor Guard set is no use.
The way I see it, Cryptic places lowest priority on this issue and chooses to rather ignore this thread than reply with yet another "Known bug, fix not immediate"...
This week i sent a ticket for missing 'rewards' for lack of a better term.
On my character Nektarios@apocalypse2001 i did the MACO style 2 and 3 projects but the tailor does not have those modifications ANYWHERE. according to others in THIS thread that i created the problem is old.
if Cryptic wants us to enjoy doing those little things with our characters they should be fixing it. If not, it's a lot of useless grinding. Did the projects, but no reward. Another black-hole.