And your right good gear doesn't make a good soldier, it's the heart that counts right?
Wisdom from the mouth of babes. That's probably the best advice anyone could give you, and you said it. Keep that mindset.
Clothes can be some of the cheapest stuff you can buy. You could try borrowing a set from someone that is pretty close to your size for your first event, or you could arrange with someone here to pick them up in person at whatever event you're both going to. If you go this route, understand that they might be late or unable to make it. Make sure you have a backup plan. More than likely someone can loan you a set or sell you something on the cheap. Also check the rules to see if you could possibly run tan cargo pants and a tan shirt. If so, a cheap tan work shirt and some cargo pants from Goodwill will only be like $25 altogether.