Gunbreaker body armor has strange physics when running with weapon out

[Pyitoechito]

Apparently providing pictures of exactly what was going on was "insufficient information", so I'll try to provide everything this time.

Bug summary: Gunbreaker running animation causing body armor to stretch oddly

Date & Time: Since 5.0 release
Frequency: Always
World name: Cactuar
Character name: Baraitar Nazzlohsyn
Class/Level: Gunbreaker Lv75
Party or solo: Either
In-game time: Any time
Area and coordinates: Any zone
Steps:
1. Be Roegadyn
2. Be Gunbreaker
3. Wear any body armor with a "skirt" (e.g., Ravel Keeper's Vest of Fending
4. Wield weapon and run

Connection Specs
- Type of internet connection/provider: Comcast
- Modem maker/model number: Arris SB 6141

■ PC Specs

To obtain the system information, open the FFXIV launcher and select Config → System Information → Display.

-=-=-=-=-=-=- System Information -=-=-=-=-=-=-

SYSTEM_OS Windows 10 Home 64-bit (6.2, Build 9200) (18362.19h1_release.190318-1202)
SYSTEM_CPU Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (4 CPUs), ~3.2GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 4 SYSTEM_CORE_PHYSICS 4
SYSTEM_BIOS BIOS Date: 12/16/15 15:34:25 Ver: V1.10
SYSTEM_LANGUAGE English (Regional Setting: English)
SYSTEM_MEMORY 8150.613MB
SYSTEM_VIRTUAL_MEMORY 134217727.875MB
SYSTEM_PAGE_FILE 12502.613MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 222.108GB SYSTEM_FREEDISC_SPACE 59.374GB
SYSTEM_STORAGE D:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 931.511GB SYSTEM_FREEDISC_SPACE 296.800GB
SYSTEM_DIRECTX_VERSION DirectX 12
SYSTEM_GRAPHICS NVIDIA GeForce GTX 1070
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP GeForce GTX 1070
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 8088.000 MB
SYSTEM_GRAPHICS_SHARED_VRAM 4075.307 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 2560 x 1440 (32 bit) (144Hz)
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_8e4f37220e99138f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_8e4f37220e99138f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_8e4f37220e99138f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_ref_pubwu.inf_amd64_8e4f37220e99138f\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 24.21.0013.9924
SYSTEM_GRAPHICS_DRIVER_DATE 9/4/2018 20:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_SOUND XG270HU (NVIDIA High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {D979784A-CA53-4AA1-8AEC-9025BDEF3E5F}
SYSTEM_SOUND_DEVICE_NAME nvhda64v.sys
SYSTEM_SOUND_DRIVER_VERSION 1.03.0037.0004
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 9/5/2018 00:00:00
SYSTEM_SOUND Logitech Speakers (Logitech G430 Gaming Headset)
SYSTEM_SOUND_DEVICE_ID {5ECF442C-B6AC-4E26-A0A9-EBE5EF27AC65}
SYSTEM_SOUND_DEVICE_NAME USBAUDIO.sys
SYSTEM_SOUND_DRIVER_VERSION 6.02.18362.0001
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 4/12/2016 00:00:00
SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 3 SYSTEM_GAMEPAD_BUTTON 8 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 128 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {47EAA1F0-4351-11E6-8001444553540000}
SYSTEM_INPUT_NAME Logitech G430 Gaming Headset
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {1E4D4550-431A-11E6-8002444553540000}
SYSTEM_INPUT_NAME Logitech G710 Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 7 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {1E4D9370-431A-11E6-8003444553540000}
SYSTEM_INPUT_NAME Logitech G710 Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {1E4D1E40-431A-11E6-8001444553540000}
SYSTEM_INPUT_NAME Gaming Mouse G303
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 652 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {1E4DBA80-431A-11E6-8004444553540000}
SYSTEM_INPUT_NAME Gaming Mouse G303
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 3 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {1E4DE190-431A-11E6-8005444553540000}
SYSTEM_INPUT_NAME Gaming Mouse G303
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {1E4DE190-431A-11E6-8006444553540000}
SYSTEM_INPUT_NAME Gaming Mouse G303
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0

Gamepad Manufacturer: Sony
Gamepad Model Name: Dualshock 4
Gamepad Part Number: CUH-ZCT2U

Browser Information
- Name and version of the browser currently in-use: Chrome Version 77.0.3865.90

So anyway, when walking or sprinting with the weapon drawn the body armor physics are normal. Any part below the waist moves naturally with the motion of the legs. But when the weapon is drawn and the Gunbreaker (only checked on my Roegadyn) runs, the area below the waist stretches forward far more than it should and looks absolutely awful. Please see below for visual evidence (but can easily be replicated in-game):