It is totally normal. I've decided not to buy new clothes until absolutely necessary or until I get really close to my goal because I'm worried I'll grow out of them. Right now I'm surviving on belts. Unfortunately, I've grown out of some of those!
There's a vintage skirt that I LOVE but It's way too big now. I love it so much I might actually pay to have it altered. I also have a pair of jeans that are my absolute favorite I've ever worn but they don't fit me as they should anymore. I'm sad about it but I'm still belting them and pretending it's the same.