Remember, too that most Rondies won't throw a fit if you're not outfitted so you'd not look out of place at the Jackson Hole Rendezvous in 1832. Goodwill is a good place to start. Tan, grey or brown corduroy pants, a pair of round toed brown shoes and an earth tone shirt will do until you can afford more period accurate duds. I started that way, the first "good" garment I got was a $10 drop sleeve shirt. That one went to the trade blanket when I outgrew it.
As you learn, upgrade your kit. Trader's row is a good place to do it and you help keep the traders in business and good stuff available at the same time. Not only that but there is a huge quantity of how-to books available as well. My first hand made garment was a capote made from a garage sale Hudson Bay copy blanket with a JC Penney label. ($4) I did it from the instructions in a pamphlet called, "The Art of Makin' Skins" by Kendall McDowell, a compendium of articles from a defunct, yet wonderful magazine, "The Buckskin Report". That pamphlet will help you get outfitted for pennies.
There's no need to break the bank in this hobby if you don't want to.
At most rondys a $5 or $10 prize refers to the value. Sometimes I just drop a pebble wrapped in a suitable portrait of a dead President on the blanket. I've yet to hear a complaint.
Three Hawks