I wonder how much of an update you need. If you get clothes that fit your new body, everything will look different, even if the styles are similar to what you've been wearing. Usually one can count on new outerwear, footwear, eyewear, or accessories to update a look. In your case, those are the things that are likely to remain, while you refresh your wardrobe with new sizes of basic clothing. I might try to get new sizes in those things that you really wish still fit right, and then go from there.