It is just as important to dress for a successful self image as it is for your career. Throwing on a pair of sweats instead of looking your best, can help promote your feelings of being dumpy and over weight. The way you present yourself to the world also affects the way you feel about yourself not just the way the world perceives you.
Allow yourself to play the part of the sexy, skinnier you with a healthy attitude right from the start. When you wish to lose weight make your goals realistic and dress the part of the women that will get there to the size you desire.