There should be no bagginess or bunching at the waist. The shirt tail should be long enough to stay tucked into your pants during normal activity. The collar should be compatible in width with your suit lapels, not tucked inside the coat or overlap on the outside. Button-down collars are all right for younger men, but may not appeal to older executives. The sleeves cuff should extend just below the wrist bone and extend about one-half inch below your suit coat sleeve.
Solid colors are usually best for interviewing with white and light blue being the best.
Other pastels are all right as long as they are pale and not bright or gaudy. Avoid prints, plaids, boxes or shirts with stitching in a contrasting color. TIES are your most important status symbol and should be matched to your shirt and suit with great care. The length should be such that when tied, the front point just touches the waist of your pants. The width should be approximately the same as your coat lapels.