put on/take off glasses - hide/show #15 acc; put on/take off gas mask - hide/show #18 acc

tutorial - https://kenzato.uk/booru/image/G1CfBc

several possible errors: 1) in the studio there are problems with joint adjustment - you need to load another card FIRST, and then change character 2) you cannot edit accessories in the material editor in the studio - just click on another character with the material editor open, and return

you may also have a problem with loading knee pads - to be honest, writing a tutorial to fix it is very tedious