Yay for you Salad! I have been trying to lose the trackies as well...it has taken a concerted effort to do, lol. In addition to the wonderful advice you have been given perhaps also consider making a semi regular date for your hair too - it has made me keep up with the clothes as I am not hiding my hair in a pony tail everyday. Also try and window shop more often - I am going once a week for a look see and trying lots on, with the pressure off to 'fix everything all at once'.
I look forward to hearing about your purchases!!!! Enjoy yourself too ( I sometimes forget this one .... ).

ETA - when you find something fabulous - buy it in several colours!!!!!!