Hello fellow plate-fashion-for-casters enjoyer!
If you are in a raiding guild, the ultimate fashion flex is a full set of
https://wiki.project1999.com/Golden_Efreeti_Armor_Set.
Another plate helm, now with a steel color:
https://wiki.project1999.com/Square_Helm
Iirc, this one is chainmail graphics:
https://wiki.project1999.com/Turtleshell_Helm
Finally, if you want to wield a sword:
https://wiki.project1999.com/Ruined_Heretic_Longsword
https://wiki.project1999.com/Sarnak_Liberator
Also, what race are you? Some races have access to cultural chain armor wearable by int casters.
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BLUE
Nadoom Battlemage (Archmage), Eolia Tournevent (57 Preserver), Momtaz (53 Disciple) & Dwaric McClerf (52 Vicar)
RED
Xeptna Stargaze (53 Channeler), Skraaa Katau (40 Shaman) & Ashnod the Uncaring (36 Cleric)