If your trims look completely normal after enabling the pack, work through these checks in order.
Quick checks
1. Is the armor actually trimmed? Only trims glow. Hover over the armor in your inventory and confirm it has a trim pattern.
2. Is it dark enough? The glow is meant to stand out in dark areas. Test in a sealed room, a deep cave or outside at night, not in daylight.
3. Is the pack in the Selected list? Open Options → Resource Packs and make sure it sits on the right side, not under Available.
4. Can you see the armor? Press F5 to switch to third-person view. In first person you mostly can't see your own armor.
Conflicts with other packs
- Pack order: Another resource pack that changes armor rendering or core shaders can override this one if it sits higher in the list. Move Emissive Trims Shaders to the top, click Done and test again.
- Shader loaders: The pack doesn't need OptiFine or Iris. If you also run one of those with a shader pack active, that shader pack may take over rendering. Turn the shader pack off temporarily to see if the glow returns.
- Graphics settings: If it still won't show, try switching the Graphics mode in Video Settings and testing again.
The pack only changes how trims are drawn, so it shouldn't slow your game down. If you notice lag, another pack or mod is the more likely cause.