Installing a resource pack in Minecraft 1.8.8 is a straightforward process:

How To Get XRay in Minecraft Java 1.21.10 (XRay Texture Pack)

: Common terrain blocks (stone, grass, sand) are rendered invisible, leaving only ores, chests, and spawners visible.

: These packs function in the Overworld for diamonds and in the Nether for ancient debris or quartz. How to Install the 1.8.8 X-Ray Texture Pack

Xray Ultimate 1.8.zip - Minecraft Resource Packs - CurseForge