I am highly allergic to just about any poisonous plant you can think of, but I don't let them stop me
You just need to understand how Urushiol works.
You have the right idea with the cheap paint suit.
After coming in contact or as soon as possible, or the sooner the better, get those clothes off and put them in the trash or the washing machine, all of them. Turn on the washer immediately and add plenty of detergent.
Get into the shower and wash everywhere immediately, thoroughly with plenty of soap, then rinse thoroughly.
Understand that this oil is still going to be on your shoes, so take care in handling them. Wash the shoes if you can or where shoes that won't be needing imediatly so you can take steps to get the oil off of the shoes you wore.
I have used this technique to travel through fields of poison oak and as long as you understand what it takes to deal with the allergen, you will be ok....or at least you will minimize your exposure.
Don't wait more than an hour or two. Do not go into your house with your clothes on and by all means do not sit on your furniture after being exposed
Also understand that these plants produce more oil in the spring and early summer and not as much in the winter. This is a lot easier to do in the cooler months.
Urushiol - Wikipedia, the free encyclopedia