Suppliers of fly tying materials have been hyping "UV" materials in recent years. Often they confuse fluorescence with reflectance, big difference! However, classic dry flies have always been using UV reflective materials --- everything reflects UV, some as low as 1%, some as high as 80%.
Below are images of an Adams in natural light and then in just UVA (320-400nm):
You can see that the UV reflectivity is high in the grizzly hackle and hackle tip wings. The grey body also is bright in UV.
So, you don't need to buy new materials. The classic dries have proved their worth in capturing trout through appropriate colors, of which UV is just one.