Business trip - need clothes 😬

So I'm going on a business trip in a few days and was just informed we need to wear business professional. Blazer, slacks, blouse, etc. I am meeting with insurance agents. Honestly I haven't been shopping in over 2 years since I've been working from home and we wore business casual when I was in the office so I have no clothes! None of my old slacks fit anymore.

Where's the best place to get reasonably priced business professional clothes? I live in the Midwest.