I suggest that no armor has any permanent or static sigils on them and instead they should have either no sigil on them or the sigil of which ever faction is using that armor or item. Some of the armors have a Vlandian Lion symbol even if you are not in that clan or faction which is awkward if you are at war with Vlandia.
These are armors have this issue:
Brigandine over Mail
Legionary Cape
White Tabard over Mail Hauberk
These are armors have this issue:
Brigandine over Mail
Legionary Cape
White Tabard over Mail Hauberk