If you are doing Malaya 41-42, helmets should me lighter, and the uniform should be in KD rather than Battledress Brown. Malaya was a tropical posting and thus standard KD. Later on they first dyed uniforms in Jungle Green, and then received proper JG. Another issue was that while Malaya is indeed Tropical (I remember a good friend from KL telling me they have two seasons, dry summer, wet summer...) the use of tropical uniform with short trousers and short sleeves was impractical on campaign due to vegetation and insects....