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FFI - The FFI Warrior of Light Amano armour is available as the tank gear from the Labyrinth of the Ancients - the helmet that goes with this set design wise was gained from the Collector's Edition of A Realm Reborn (or can still be gained by upgrading your FFXIV license to the Collector's Edition on the Mogstation). Additionally his sword and shield are gained from the Seat of Sacrifice EX trial. Additionally the Legacy Warrior's gear gained formerly from a past Rising event but now available on the Mogstation resembles the Fighter's default appearence in FFI.
FFII - Firion's attire the Wildrose armour was formerly a Veteran Reward but is now gained from Jonathas in Old Gridania with Achievement Certificates.
FFIII - The Onion Helm was a bonus gained with the Collector's Edition of FFXIV version 1.0, but is now unattainable. A Red Onion Helm however is still available and is a possible reward from Retainer Quick Ventures, as is the rest of the Onion Doublet set. Additionally an Onion Shield is available for purchase from Rowena's store with Allagan Tomestones of Poetry, and the Onion Armour set is the DRG/RPR/heavy melee set from the Labyrinth of the Ancients. FFIII enemy attire is also found in the later Crystal Tower raids (specifically Syrcus Tower)
FFIV - the Moonward gear added with Endwalker resembles Amano's designs for FFIV's characters (the Moonward tank gear for instance is based on Cecil's PLD appearence), and these are gained with Allagan Tomestones of Casulity from Radz-at-han. Additionally, the Baron Helm and Baron Circlet (gained with purchasing the Collector's Edition and preordering respectively of Heavensward) are based on Cecil's headgear for DRK and PLD respectively from FFIV.
FFV - the Chicken Knife from FFV was a preorder bonus for preordering Stormblood and was a weapon for RDM. Additionally the Wayfarer's attire gained during the storyline in Endwalker patch 6.1 closely resembles' Bartz's default appearence in FFV. Krile's Cat-eared hood is also available for purchase on the Mogstation.
FFVI - the Gambler's attire gained with MGP from Gold Saucer is based directly on Amano's artwork of Setzer in FFVI.
FFVII - Cloud's Advent Children costume was formerly available as a Veteran Reward but is now available for purchase from Jonathas in Old Gridania with Achievement Certificates.
FFVIII - Squall's Dissidia costume was formerly available as a Veteran Reward but is now available for purchase from Jonathas in Old Gridania with Achievement Certifiicates. Additionally, Squall's Revolver gunblade for GNB is gained from the Collector's Edition of Shadowbringers, his Lion Heart gunblade (in name only) is the level 80 AF4 weapon for GNB gained from Grenoldt's store in The Tempest, and finally the name for Seifer's gunblade, Hyperion, is the name of the level 89 AF5 weapon for GNB gained from Tataru's store in Old Sharlayan.
FFIX - Zidane's outfit was formerly available as a Veteran Reward but is now available for purchase from Jonathas in Old Gridania with Achievement Certificates.
FFX - Tidus and Yuna's outfits were formerly available as a bonus for purchasing tickets to a past FFXIV Fanfest, but are now available for purchase on the Mogstation.
FFXI - the Wootz tanking set and the Wootz DRG set are based directly on the design for the Koenig armour in FFXI and is crafted gear. Additionally, the Vermillion Robe (the Vermy) for mages and the Scorpion Harness for melee from FFXI are gained from completing the Eureka missions. As well, the Death Scythe from FFXI is a RPR weapon gained from the Collector's Edition of Endwalker, and the Lightbringer (San d'Oria's infamous relic in FFXI) and the Deathbringer (DRK quested weapon in FFXI) are the names of Endwalker level 89 AF5 weapons for PLD and DRK respectively (gained from Tataru's store in Old Sharlayan), although they're different designs. Finally, Iroha's attire from FFXI's Rhapsodies of Vana'diel missions was formerly gained from a special FFXI crossover event, but I believe is unattainable.
FFXII - FFXII character attire is gained from the Return to Ivalice raids fittingly (specifically Vaan, Balthier and Penelo's attire), and Fran's costume is the default racial costume for female viera characters (it can also be bought very cheaply from a vendor in each of the three cities). Additionally the Law gear based on the armour worn by the Judges of Archadia in FFXII are gained from completing Bozjan restistance content.
FFXIII - Lightning and Snow's attire from FFXIII, along with FFXIII, XIII-2 and LR-XIII themed weapons were gained formerly from a FFXIII crossover event, but are now gained by purchasing them from the Mogstation.
FFXV - Noctis's default attire was gained from a special FFXV crossover event, but is currently unavailable.
FF Tactics - like the FFXII gear, certain FFT Job and character gear is gained from the Return to Ivalice raids.
Unfortunately female protagonist attire is not as common as male attire sadly, but there is some still there (thus for now you can often subsitute other pieces for the same effect - for Terra for instance use Rydia's outfit (Moonward gear) and dye it Dalamud Red), and that is part of the fun of glamour - necessity is the mother of invention after all! ;)