Let somebody else wear the clothes that are the wrong size for you now. GIve them to charity. Some woman will be very thankful.
Concentrate on dressing the body you *have* - beautifully.
Once you have children, your body shape changes. That's just the way it is, and it's all right. You're still as good-looking as you were - but in a different way. Once I had my first, for instance, I had to give away a lot of clothing because my bust size was permanently bigger (so was my shoe size!).
If you really want to lose the weight, I hope you do! But then celebrate by going shopping for stylish clothes, rather than digging out boxes of out-of-date things. You'll even want to get new jeans.
Let the old things go, and like yourself the way you are right this minute. I'm sure you *don't* look terrible, right?