How can I create a transparent material to display decals from both sides?

I have a human body figure that by click you can add marks (decals) on it, very similar to the Decals Example Here , i want to be an to view the marks i’m painting from all sides of the body - so if i’ve added mark on the back - i will be able to see it the chest area as well - since the body should be transparent…

I’ve added the following code - but it does’t seems to work - as you can see in the pictures.

new THREE.MeshPhongMaterial({
      opacity: 0.2,
      transparent: true,
     // side: THREE.DoubleSide,

As you can see - the marks from the back side do not show in the front side although the material is transparent with opacity.

One way to solve this issue is to make the decal material double sided and deactivate depth testing. I’m updated the official example with this approach:

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Thanks!!! You are the best in whole world - many many thanks