Fish tale plait, help?

I have a trial day at a salon tomorrow (a day i have to work to see if they like me and if i fit in ETC.) but i don't know how to have my hair, do you think a fish tale plait would look ok? or is it too unprofessional? I have to wear all black and i'm going to wear my Vivianne Westwood earrings. Do you think i should do a fish tale plait or something else? I have hair that goes to my bra strap so the plait would be medium length. Thank you :)