This question often arises in one's mind while going for an interview and rightly so for this fact can left a long lasting impression on the minds of the interviewers. Always wear cotton clothes and avoid bright shades. Dress formally and care should also be taken about the foot wear which you are wearing. Wear trousers and shirts along with formal shoes and a tie. Females should also dress in formal shirts and trousers. Try to keep a tidy hair and a fresh looking face throughout the interview...Wish you all the best!!!