dogtypingonakeyboard

Agreed with above responses - I would also consider a comfortable sweater (ie: cardigan) or sports jacket (of a more casual material) over a button down. No ties, unless you are interviewing - better to be over prepared and able to remove items of clothing such as your tie, than under prepared and feeling sheepish. Neutral colors are also encouraged, as you don't want to appear over zealous. Best wishes!