不要买黑色西服套装for interview。dark grey，blue 很好。

You should not wear black to interviews. Black is for movie stars, cocktail parties, and funerals. Since your interviews don't fall into those categories, you should stick to navy or dark grey. You simply can't wear a back suit to an interview. If you do, you will quickly realize that you are the only one doing so, and everyone else will notice as well.