I don't mind what you wear. However, I advise against wearing stripes as they can look distorted in photos. For a bit of symmetry, I recommend the group where complementary colours, but not to go too 'matchy-matchy' – you aren't a bunch of twins trying to look alike! If you want to express your personality through your wardrobe, I welcome it. However, just ensure that whatever you wear is a contrast against the backdrop, so you don't look washed out or fade into the background.