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