it's not only the makeup, it's the whole package, it's good

to wear suit. skirt is always safe. you never know how conservative the interviewers are. many american males' mind set are still in 50 years ago. as long as the outfit/makeup looks good on/fit you, the price can be as cheap as you like. however, spend the most money on a good bag. it worth it.
if you haven't go to Liu Xing Shi Shang forum, please do. they're all expert can make you an expert too.

good luck.