Listen to unmanufactured smaller labelled music - the blatently obvious bit.
they like bands such as : the strokes franz ferdinand and the cribs ( for those who werent too sure)
Many indie kids will quite easily be mistaken for an emo or scene kid - this is due to scene and emo's being newer groups, which have taken many indie attributes eg- drainpipes, blazers, polkadots and beads
Unlike emos, indies are happy and dont over do the hair ( too much spray/gel)
unlike scene kids, indies dont act childish or obsessive
indie kids can often seem arrogant, though many are not, and are actually very friendly people.
indie kids like to find bands that others have not heard of yet, and can get easily annoyed when people rave about that band once it is in the public eye (eg - arctic monkeys)
indie kids are generally quite smart and do tend to be well kept (like to look quite good, but not overdone)
indie kids like to be a little different, but more importantly like to be themselves.
i suppose myself, an indie kid would wear: drain pipe or straight legged trousers, and a blazer. my hair is parted, but not over done or covers and eye like an emo. i wear white trashed converse
but this is purely because there my favourite shoes and are so comfy because theyve been worn so much :)
a good example of a scene kid, would be very the same, but there hair would be much over done and they may wear make up ( boy ) there myspace will be well overdone, like be set out completely different and would have a good 300 friends, none of which they know, but would be other scene looking kids.
an emo : would wear either looser or drainpipes jeans and probably black converse, generally any colour but white. black shirts, infact as much black as posible, hair would be parted and go over there eye, and hair may be spiked at back. will be depressed and can be quite arrogant and morbid.