I have had a look and haven't found this posted on here yet,
I can't take all the credit for this I got the idea from a loadout article in airsoft international.
I took my ACU trousers and bought some water soluable dye (I used dylon but am not sure what you have available in your area)
I mixed three colours according to the instructions on the packet and put them in a plant spray bottle and used it like spraypaint to cover the trousers.
After leaving it to dry overnight and then washed it again according to the instructions.
The results:
If I was to do it again I would use more brown and perhaps spray each colour twice as it is a little light.
A word of caution the dye mixture is slightly caustic so cover the floor and walls and wear protection on your hands to prevent having multi coloured hands.
I can't take all the credit for this I got the idea from a loadout article in airsoft international.
I took my ACU trousers and bought some water soluable dye (I used dylon but am not sure what you have available in your area)
I mixed three colours according to the instructions on the packet and put them in a plant spray bottle and used it like spraypaint to cover the trousers.
After leaving it to dry overnight and then washed it again according to the instructions.
The results:


If I was to do it again I would use more brown and perhaps spray each colour twice as it is a little light.
A word of caution the dye mixture is slightly caustic so cover the floor and walls and wear protection on your hands to prevent having multi coloured hands.