How do you handle buying clothes while losing weight?

I'm currently losing weight steadily (lost about 30lbs and got about 55 lbs to go) and need new clothes, because my old ones have gotten so loose that it's embarrassing to go outside with them. However, I kinda feel like I'm wasting my money if I buy clothes now, because I will likely continue losing weight and my relatively new clothes will look not suit me anymore.

On top of that, I never realized that clothes are this expensive!