Add file to your Fallout: NV folder following
this path from your main FO:NV folder, wherever
that may be on your PC version:

Data>textures>TacticalVest

I recommend you make a back-up file of the
original in case you change your mind later.

This texture is used on both the regular and
bulky varients of the Tac-Vest.

This is my first retexture for any DDS file,
and I hope it suits your taste.

If you don't know how to edit DDS textures,
and have Photoshop, check out this free NVIDIA
DDS plug-in at the following site:

https://developer.nvidia.com/nvidia-texture-tools-adobe-photoshop

I advise installing both the 32-bit and 64-bit
versions. FO:NV uses the 32-bit version, but one
would be wise to also add the 64-bit, too.