If I walked in to a designer boutique wearing a cheap but well put together outfit, would I be accepted?

I understand, it's aggravating. But, you would be accepted. I'm not poor, but I definitely could not afford something that cost anywhere in the 100s for clothing. You'll be accepted I promise. There are people who can pick that kind of stuff out, but most, except for snobs and what not, won't judge you for it. Most understand wants and money issues.