Best thrift stores around?

Hi y'all, I'm new to the area and I'm planning on going to the Oregon renfair next month. I was hoping I could probably thrift my costume this year as I'm on a tighter budget. I was wondering if anyone had any recommendations for thrift stores in general, and for ones who might be better for renfair finds. For context I am a plus sized person so I also need varity on size options too. Sorry if I'm asking for too much 😅