Modder ApolloHoo released the first mod for Sekira: Shadows Die Twice, which strips the main character.
If desired, you can choose a female model. ApolloHoo used 3D models from Dark Souls 3, it is seen by the difference in texture on the neck.
To install the mod, first you need to download the Mod Engine. Then, you load DS3 and Bloodborne Material Pack and copy the folder parts of the Naked Characters Pack in its own folder with a mod.
Sekiro: Shadows Die Twice is available on PC, PlayStation 4 and Xbox One.