Magic bikini
From Dragon Quest Wiki
The magic bikini is a special outfit in the Dragon Quest franchise. This beach outfit for women provides some protection against harmful magic.
Appearances
Dragon Quest III
The magic bikini has a defence bonus of +65 and reduces magic damage taken by 33%. It can be equipped by any class as long as they are female. One can be obtained from the owner of Asham's theater after speaking to Lena in Damdara's inn. It also changes the wearer's appearance outside of battle.
Dragon Quest VIII
The magic bikini has a defence bonus of +50. Only Jessica can wear it, and changes her appearance accordingly. It can be purchased in Arcadia for 13,800 gold.