This forum thread contains a list of all available weapon costumes including a screenshot and where you can get them from.
The Summon Stones come directly from cash shop, you buy the item and then choose 1 weapon costume from that stone.
Other weapon costumes can be bought at map "Cite de Reboldoeux" from NPC "Costume Trader, Johanna".
The NPC will ask for 1 "Weapon Costume Exchange Coupon" from the cash shop per costume.
Index (Summon Stones / Weapon Series)
The Summon Stones come directly from cash shop, you buy the item and then choose 1 weapon costume from that stone.
Other weapon costumes can be bought at map "Cite de Reboldoeux" from NPC "Costume Trader, Johanna".
The NPC will ask for 1 "Weapon Costume Exchange Coupon" from the cash shop per costume.
Index (Summon Stones / Weapon Series)
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