Hello Asi Pel,
The right colours of the DAK uniform, if you could use Vallejo Modelcor, can be various shades with the number 9 Amarillo Arena, 123 Arena Oscura and 124 Arena Iraqui, owing to the weathering of clothes very used and exposed to sun and sand winds. But if you don't use Vallejo, what brand are you thinking? I can find the correspondent references among Tamiya or Humbrol.
Regards
MdM