I dont know how it could be said with more detail but here it is again.
Even if it IS tedious work the problem is there are no avalible models to replace the old clothing, that and the fact that the Ballistic Mesh jacket and Ribbed jacket models are the same as the clothes models means if you replace the clothing models the jacket models will change also. It would also require a lot of 2da editing, mdl/mdx renaming, and texture renaming. If you did make the jacket models unique items what would you use for their normal clothing?
See the problem?
One more thing, we modders do these things in our free time... this aint a service where you request something and in 24-48 we send you the finished product