I was flicking through magazines the other day and there seemed to be a lot about how what you wear dramatically affects the way you come accross.
For example, it mentioned 'power dressing' which I think is so true - that say, wearing high heels can make you feel powerful, work harder and have a better day. And the same for 'comfort dressing' - which has been tried and tested by me many times: wearing something quite understated which makes you feel really good, for example, jeans and maybe a nice top, can make you feel like you fit in and therefore are more relaxed and content.
Also, I find that wearing something new makes me feel better about myself. Even if it's underwear - I think it's just a nice feeling. I have no idea why, but it does - Primark is great because it's so cheap, you can buy loads of new things and feel great when you wear them for the first time!