I took the liberty of using the photo from your post for testing. Here is a quick result:



You need to adjust the sliders under Diffuse HSL until the image is as you want it.

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

So I purchased Essentials. Now I can apply my design on cloth. But instead of my design with briljant colors I get
a transparent overprint. Sliders normal and normal strength are not working.
What's wrong with me or my application?

Thank you for the clarification, Rampa.
It's so hard to remember what is in the base product, what is premium functionality, and what is add-on content.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

The custom decal option is only available if you have the "Essentials" pack for the character creator. If you plan to do a lot with iClone, it is well worth getting, as it also contains many more options for character customization.

Hopefully this picture helps.
Use "Diffuse = Custom" to pick any picture you want.
Then use "Type = Input" to apply it.
(You'll probably want a transparent "alpha" background for the decal.)

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

In decal 1 you have input, eagle, skull etc. Where can I find my own designs?

I'm not sure what you mean by "default decal files".

In Character Creator the clothing articles have decal "materials" applied, at least in most of the items I looked at.  There are different decals for different areas of the clothing (for the t-shirt decal 1 is the chest area).  There are no decals normally applied to the blank t-shirt, so I don't understand what you are looking for.

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Alienware Aurora R16, Win 11, i9-149000KF, 3.20GHz CPU, 64GB RAM, RTX 4090 (24GB), Samsung 870 Pro 8TB, Gen3 MVNe M-2 SSD, 4TBx2, 39" Alienware Widescreen Monitor
Mike "ex-genius" Kelley

But where do I find the default decal files?

Thank you. I used decal and it worked well.

Or just do it in CC (I did it in about 10 seconds).  Use decal 1 for a t-shirt:

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Alienware Aurora R16, Win 11, i9-149000KF, 3.20GHz CPU, 64GB RAM, RTX 4090 (24GB), Samsung 870 Pro 8TB, Gen3 MVNe M-2 SSD, 4TBx2, 39" Alienware Widescreen Monitor
Mike "ex-genius" Kelley