Dragon Quest BuildersEdit
This item can be acquired in Dragon Quest Builders. During Chapter 3, Kol and Galenholm, through the Red Teleportal, you can find a big bridge, guarded by hunter mechs and killing machines. The chest containing the Scandalous swimsuit is hidden under the bridge.
The game allows you to reach the item easily if you go down the shore and start digging around the bridge to find a tunnel filled with dirt, allowing players to not tamper with the bridge itself. You can also dig straight down with powerful enough items though, but it's recommended to not have any companions if taking this path.