depends on industry and compan

company

basically, no-sleeve top, open-toe shoe, above-knee skirt, jeans are not appropriate

make-up nessary, unless you get up too late:) perfume not necessary

first week, dress safely; second week you will know what to wear by observing what others wear; even they are all guys, you can still observe, if they are in suit, then you should wear suit too, if they are in polo or shirt, then business causal, ...

Any case, brand name is not necessary