Body Slots usage for Fallout 4
This guide includes all the body slots available for armours in Fallout 4 and their standard usage. Some of them are already used by Bethesda. In the case of slots not used in vanilla game, this guide indicates the reference usage that has been set by consensus between modders.
Available body slots
30 - Hair on top of head/most hats 31 - long hair/flight cap linings/under helmet/hat hoods 32 - FaceGenHead (used if your worried about the face clipping through a full face mask) 33 - Full outfits - Shoes/Boots 34 - Left Hand 35 - Right Hand 36 - Arm Add-on (Bracelets), Melee weapon on back 37 - Torso Layered Add-on (Jackets) 38 - Separate Tops (for vanilla outfits that need a second slot to show all armatures-Cage/Spike/ChildofAtom) 39 - Leg Add-on (Gun on Hip/Tights/Stockings/Vanilla outfits that need a third slot to show all armatures-ChildofAtom) 40 - Separate Pants/Shorts/Skirts 41 - Torso armor 42 - Left Arm armor 43 - Right Arm armor 44 - Left Leg armor 45 - Right Leg armor 46 - Masks that cover face/headbands/(hats/helmets/hoods meant to show all hair) 47 - Eyes (Glasses/Eyepatchs) 48 - Beard (surgical mask/lower face masks) 49 - Mouth (surgical mask/lower face masks)(toothpick/cigarette/joint/cigar/blunt/lip rings) 50 - Necklace/Scarfs 51 - Ring 54 - Backpacks/ Capes/ Cloaks 55 - Satchels 56 - Shoulder Harnesses/Bandoliers 57 - Plate Carrier/Cargo Pack Vests(front and back torso)/ Belts(utility belts/gunbelts/sword belts)/ Capes/Cloaks(alternate backup slot) 58 - Body Jewelry (piercings)/ Gun on back 61 - Off-Hand Accessories (Sword Sheath/Decorative Gun/SOS)