Pencil skirts are great. What do you envision paying for the interview outfit (or 2 - because if there's a call back, you'll have to wear something different)? What stores are available to you in your current location? What is your figure type? Some brands are cut for a certain body type and, while well made, don't fit unless you're straighter or curvier, etc. Sounds like a fairly formal environment: black or navy blue suit, preferrably a light blue or medium blue button down (or in any color that looks good on you and that you've seen male businessmen wear regularly), small pearl earrings (stud or drop are fine), a nice non-flashy watch, black matte heels under 3" (or you might be able to pull off higher heels with your height - make sure you can walk professionally in them - I'd try to avoid platforms, red soles, anything not super basic), possibly pantyhose. Maybe a pearl necklace or a small pendant necklace (with a pearl pendant, lol). amidprivilege.com has some great suggestions for realistic business wear, both for interviews and the corporate world.