Knight Errant the mod's own
12 pieces, a skin, a cloth. One of the outfits that ship with the mod: in the game, /armorpieces stage set knight_errant dresses a stand in it. 12 from Knightly.
Knightly: iron on iron, so every plate part takes the darker variant and reads as one suit, with gold on the guards and one loud red for the crest, the banner and the inlay.

The picture above is the editor's, taken when the outfit was saved. The real figure is the editor itself, and it is handed the pieces this outfit borrows, so it wears every one of them. Open it in the dressing room to turn it round or change it.
One zip, both halves, with a function that gives the whole set. Needs the Armor Pieces mod, 0.3.0 or later, on Minecraft 26.2.
Brush Crest
crest · redstone
Spaulders
pauldrons · iron
Gorget
collar · iron
Vambraces
vambraces · iron
Tassets
tassets · iron
Poleyns
knees · iron
Wearing it
helmet · minecraft:iron_helmet · too long for a chat line; use a command block or the pack's function
/give @s minecraft:iron_helmet[armorpieces:decorations={brow:{material:"minecraft:iron",decoration:"armorpieces_knightly:great_helm",fittings:{"armorpieces:guard":"minecraft:gold"}},crest:{material:"minecraft:redstone",decoration:"armorpieces_knightly:brush_crest"},horns:{material:"minecraft:iron",decoration:"armorpieces_knightly:cheek_guards",fittings:{"armorpieces:guard":"minecraft:gold"}}},armorpieces:skin="armorpieces_knightly:plate"]chestplate · minecraft:iron_chestplate · too long for a chat line; use a command block or the pack's function
/give @s minecraft:iron_chestplate[armorpieces:decorations={back:{material:"minecraft:iron",decoration:"armorpieces_knightly:banner",fittings:{"armorpieces:banner":{base:"red",patterns:[]}}},collar:{material:"minecraft:iron",decoration:"armorpieces_knightly:gorget"},pauldrons:{material:"minecraft:iron",decoration:"armorpieces_knightly:spaulders"},vambraces:{material:"minecraft:iron",decoration:"armorpieces_knightly:vambraces"}},armorpieces:skin="armorpieces_knightly:plate",armorpieces:cloth={cloth:"armorpieces:tabard"}]leggings · minecraft:iron_leggings · too long for a chat line; use a command block or the pack's function
/give @s minecraft:iron_leggings[armorpieces:decorations={belt:{material:"minecraft:iron",decoration:"armorpieces_knightly:girdle",fittings:{"armorpieces:guard":"minecraft:gold","armorpieces:gemstone":"minecraft:redstone"}},knees:{material:"minecraft:iron",decoration:"armorpieces_knightly:poleyns"},tassets:{material:"minecraft:iron",decoration:"armorpieces_knightly:tassets"}},armorpieces:skin="armorpieces_knightly:plate"]boots · minecraft:iron_boots · too long for a chat line; use a command block or the pack's function
/give @s minecraft:iron_boots[armorpieces:decorations={spurs:{material:"minecraft:iron",decoration:"armorpieces_knightly:rowel_spurs",fittings:{"armorpieces:guard":"minecraft:gold"}},greaves:{material:"minecraft:iron",decoration:"armorpieces_knightly:greaves",fittings:{"armorpieces:inlay":"red"}}},armorpieces:skin="armorpieces_knightly:plate"]The pack above has to be installed for these to do anything; its function gives the whole set in one line. Open this in the dressing room to change it.
Something wrong with this outfit? It ships with the mod, so the answer is a release rather than a takedown: tell us by email.