This is quite an important issue, given that style is one of the few things left for the Endgame:
The Flawed and Perfect Mask of Seerus are way to big. I don't mean "a bit" or "difficult to match" but really just "to big". Even the armors with wide neckpieces don't help. The Flawed mask, while lacking the scarf, still has a difficult mask-jaw. The "Perfect" Mask is just ridiculous when looked at through inspect or when logging in. Depending on your armor even from above.
Yes, the mask looks nice as a design, but when worn?
I can only guess why I rarely see anyone wear it as a costume any more, but my bets are on the fugly neck.
Simple solution: Making it a tad smaller with a narrower neckpiece.
Even though I've never worn it before, my friends have and it looks absolutely ridiculous. Maybe its just me, but the mask makes them seem a whole lot shorter.