I disagree with GymnastPower. Having been acting since I could stand, as an extra you definitely want to blend in. My friend once even dyed her hair brown instead of red for an audition (I don't suggest you do this but you get the point). Wear something causal in pale colors. or brown, tan, or white. I suggest casual hair, brown T-shirt, old but not gross jeans, and Vans. Be nice but don't throw yourself at everybody. Do be ready- make sure you know what you need. In some auditions, they'll line you up and pick you from there without any speaking from your part. In others, you may have to sing or recite. Just go with the flow and be prepared. Don't mess up sort of goes without speaking. Even if you do though, it probably won't be that a big a deal since its just extras. Yes, be on time, but don't come alone of be the first or last person there. ᗪO ᑎOT ᗩᔕK TO ᗪO ᗩᑎYTᕼIᑎG Iᑎ TᕼE ᖴIᒪᗰ Oᖇ ᔕEᖇIEᔕ. TᕼEY ᗯIᒪᒪ ᗰOᔕT ᒪIKEᒪY ᗰᗩKE ᑕᕼᗩᑎGEᔕ ᗩᑕᑕOᖇᗪIᑎG TO ᕼOᗯ EᐯEᖇYTᕼIᑎG ᗯOᖇKᔕ ᗷᑌT TᕼEY ᗪO ᑎOT ᗯᗩᑎT TO ᑌᑎᒪEᔕᔕ TᕼEY ᕼᗩᐯE TOO. I ᕼᗩᐯE ᔕEEᑎ ᑭEOᑭᒪE GET KIᑕKEᗪ Oᖴᖴ ᖴOᖇ TᕼIᔕ. Overall, those are my tips. Good Luck!