Nepgear Maid Costume can be obtained through the quest "For Me, Please?", the requirment is beat 1 Ultra Shampuru which is in Panan Jungle after used add enemies plan
Uni Maid costume can be obtained through the quest "Performance Test", the requirment is beat 1 Deus Ex Machina which is in Arfoire's Factory after after used add enemies plan
Rom Maid Costume can be obtained through the quest "Annoying", the requirment is 3 Slippery Wing which is drop from a monster called "Penguin" in Septent Resort after change dungeon
Ram Maid Costume can be obtained through the quest "Best Salaryman Ever", the requirment is 4 Magical Contract which is drop from a monster called "Hachibei" from the World Labyrinth 1st Floor after change dungeon
Vert costume can be obtained through these quest
"On the Bench", the requirment is 3 Teppachi which is drop from the monster called " sergeant froggy" in Powerlevel Island after change Dungeon
"Troublesome Company", the requirment is 5 Blue Seed which is drop from the monster called "Blue Sun" in Lan Castle Depth
"Planeptune Restoration", The Requirment is 5 Magic Stone, 5 Orichalcum, 5 Gold Ore, Magic Stone is dropped from monster called "Armor Shell" in Panan Jungle, Orichalcum can be found in (Gather) Lan Castle Depth after change dungeon, Gold Ore can be found in Junk Box
Noire Costume can be obtained through these quest
"Inafunashi!", the requirment is beat 5 Monkey Balancer in Icicle Pathway
"Working at the Basilicom", the requirment is beat 9 Dealy Spider in Lan Castle Underground
"All Eyes on Her", the requirment is 3 Carroteer Leaf which is drop the monster called "Carroteer" in Panan Jungle
^ Note that some of these quest only avaiable on NG+
All the chacrater swimsuit (include the Maker) can be make from the plan dropped by monster called "Lizard King" in Powerlevel Island after change Dungeon, the ingredient for each costume
Nepgear
Tiny Outfit : Drop from a monster called Speckle in Gapain Field after change dungeon
Water-Soluble Cloth : Drop from a monster called Bashful from Septent Resort
Wicked Heart : Drop from a monster called Strange Person in Powerlevel Island
Uni
Tiny Outfit :
Venomous Cloth : Drop from a monster called tarantula in Atari Marsh Depth
Old Man's Pathos : Drop from a monster called Old man Deus in Servered Dimension after change Dungeon
Rom
Tiny Outfit :
Moonlight Shadow : Drop from a monster called Speedy in Lan Castle
Bloody Boomerang : Drop from a monster called Boomerang in Powerlevel Island
Ram
Tiny Outfit
Invisible Cloth : Drop from a monster called Pinky in Lan Castle Underground
Sharp Fang : drop a monster called Wild Dog in Servered Dimension Depth after change dungeon
All the material requirment for other maker chacrater is same as Ram
Once you unlocked the maker chacrater, later there will be some chirper event that will give you the plan to make costume for them (except for broccoli, the plan to make her costume is the reward from Stella Dungeon,...Underverse if i remember correctly). The main ingredient for each costume is
Cool Boxbird Wing : Drop a monster called King Boxbird in Septent Resort after change Dungeon
Invisible Cloth
Connecting Hook
Lost Holy Cloth : Drop drom a monster called lost boy in Lan Castle Dpeth after change Dungeon
Hidden Item Costume
Nepgear:
Royal Knight: hidden treasure Midcompany
Uni:
Tunnel Armor: hidden treasure Lan Castle
Rom:
Sunny Robe: Iris Field
Ram:
Moon Robe: Atari Marsh (2nd map)
All the Dungeon in Chapter 7 (Junk Box, Infinite Corridor, Icicle Pathway) have one costume for Blanc