Naaaah... it's only a mod. Many people asked Dev to add this Nun outfit to the game but it still was not added... but someone got tired of waiting and personally make a Nun outfit mod...
buuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuut...
this Nun outfit mod only works normal with big booba mod which is not displayed very correctly and because of that it needs some fixes to work adequately. Also this Nun outfit mod have not enough portraits, so half the scenes will be without the Nun costume at all therefore you will have to finish and rewrite some portraits by yourself so that it all works very properly...
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaand...
the only option now is to add only portraits with replacement files because if you try to add something like new file/mod in the LonaRPG it can lead to new errors that you’ll have to deal with yourself again therefore you will spend more time...
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaand...
if LonaRPG is updated there is a chance that another new bug/error will appear which you will need to deal with again and again and again...
In short - it’s a pain in the ass but it is possible.