Costume for Character and Fake band.

Chinos will suit our character of the artist. I think that their smart/indie look will be perfect to convey our mysterious artist character because they are quite popular in the indie genre and are quite fashionable at the moment.
These brogue shoes will also suit our artist character, this is because of the smart style and because they're in fashion. This will also suit our music video because they can easily look new and in pristine condition they can be in. This is generic in music videos.
This t-shirt and jacket will be perfect for our artist character because of the smart disposition that we want him to convey. These also go with the Chinos and the brogues to give the idea of being smart/casual because our character will look slightly smarter than the general public but not so much so that he will really stand out.

Fake Band

For our fake band, Skinny jeans and plimsolls will look indie because this is what most "indie kids" wear. This will also make our fake band blend in with the general public when they're busking in the street. The jeans and plimsolls with also look new and clean to fit in with the general conventions of music videos.
This kind of messy hair is perfect for our genre and would really suit our fake band, even if only 1 or 2 members have it.
This is the kind of casual jumper I think will suit our busking band. This jumper is in fashion at the moment and the christmas style ones are popular with "indie kids". This jumper will also suit our skinny jeans and plimsolls as well as keeping the actors warm when we film outside.