u/Effective_Try_1890

You MUST have the helmet already saved on the outfit before merging. If you try to merge the mask and helmet at the same time you take off the helmet once leaving the mansion.

Select the mask you want to merge and go to this drinking table of the first floor of the mansion. Press RIGHT on the DPAD to step up to the table. Press X to pour a drink. Press RIGHT on the DPAD to drink and step away. Your mask will now be gone and your outfits will be grayed out.

Make your way down to your bedroom to change your outfit. Select your outfit from a saved outfit with a helmet.

Now leave the mansion and the mask will be merged.

HAPPY GLITCHING