What is the "fashun" that Bakha and his friends adhere to, and why do they do it? (4)

Bakha and his friends Chota and Ram Charan mimic Western dress and customs as much as their circumstances allow them to. Bakha wears British military clothing and sleeps on a mat, under a blanket, instead of in a string bed with an Indian quilt, and Chota wears his hair oiled and parted in the English style. They smoke Red-Lamp cigarettes whenever they get the chance. Regardless of how impractical these choices are, they are important to the three young men, as this British "fashun" makes them feel more modern and sophisticated than the rest of the outcastes.