GIMP Version: 2.10.6
Operating System: Windows
GIMP Experience: Basic Level

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how do you put texture on clothes and make it fit im having hard time how work gimp and how you do other texture and Icon every time I ask help no answer me just Ignore me . btw that shirt I made on my own

Here's a simple way to add some realism.
First, resize your motif like the skull in my example to fit the shirt.



There are two important things, blend mode is the first.
The wrinkles and shapes have to be see-through, grain merge and hard light usually work well.
But it depends on colors, sometimes you have to tweak. You can also play with opacity.
Note! Gimp 2.10 added more blend modes, I did this with 2.8

Changed the blend mode of skull to grain merge.



Second step is warp or displacement, which shapes the motif.
The layer size of the background (shirt) and your motif must be same.
Use "Layer to image" filter on the motif layer.
Then you can use Filters->Map->Displacement.
I'm just using 12x vertical displacement.
Make sure the background layer is selected on both layer drop-downs.





That's basic, you could add white base and also cracks/wearing to make it more realistic.
T-shirt prints wear out quite fast with frequent use and washing.
If I made something on the jeans, I would rather make a fabric patch, sweatpants have similar prints than shirts.
To shape the motif for butt, displace does not work that good, you can use Filters/Distort/Curve Bend or iWarp.
Will try out with 2.10. I can't remember what new tools it had but it may have a better mesh warp tool.

Edit: Duplicated the displaced skull layer, and changed blend mode to color:

Hey that's cool, Nidhogg

But I always iron my T-shirts. They don't have that many wrinkles

Thank you Ella Louise.

Agree with Ella Louise, cool and a good tutorial Nidhogg.

I don't think Mrs Nidhogg irons the T-shirts.....what am I talking about?

Thank you very much Nidhogg

Also if you need a visual instruction, Wallace has a video which is very good. Only about 6 or 7 minutes.

https://www.youtube.com/watch?v=2ot6I7frxZA

Thanks Tas_Mania.
There is no Mrs Nidhogg, but my cat does pretty good job with flattening the shirts.
I do the tape rolling after she's finished, which takes usually considerably long.