^^
Can I correct you. British first started to use Khaki in what is now Khyber-Paktunkwa province, Pakistan but was known than as North West Frontier Province. The British Army in South Asia was continously involved in fighting the Pashtuns of the NWFP and the British Red uniform would make ideal target in the semi arid terrain common in Pakistan. It was than the Khaki was adopted by British and in in time all their army went khaki.
If you look at British Army in North Africa in WW2 [ Eygpt, Libya, Tunisia and Algeria ] the Khaki was used, the green Italian uniform and green olive German uniform was changed to Khaki for the Afrika Korps because the region is arid to desert. In Europe though the green - brown was used. Today most European Armies use green, light green to brown mix to reflect the European environment.
In the Middle East Khaki or other similar derivitives are in use again because of the desert environment. Now from what I know Bangladesh is lush green tropical region [ if it is arid or desert please correct me ] therefore logic would translate that the uniform should be green. What colour is your neigbour Burma, Thailand?
Let your environment dictate the colour. In Pakistan we now use khaki or khaki with dark brown mix to reflect our environment unless of course it is troops in Siachen when they wear white overalls because of the snow.
Just as a note any Eurpean forces operating in or near Pakistan, Afghanistan or Middle EAst still change over to khaki or khaki brown because their home version green would stick out in this part of the world.
So look around your country if the predominant look is arid or desert change to Khaki-brown, if it is lush green change to green, if it is snowy white go for white.