Not sure if this belongs here or under shopping. I need to buy a few things asap and I don't even know where to begin. I work from home running a non profit and I work outside part time. Basically I live in jeans and sweat shirts.

Our non profit is starting our first big fund raising campaign and I'm going to be going to lunch with potential donors, attending and hosting events, and having to look more presentable doing so. I am on a tight budget, so I would love a few versatile suggestions that I can mix and match to make a few outfits that I can use for these events and lunches. I want to look grown up but not overly dressy (we live in a casual, rural area). Ideas?