Dye and costume washing

So i bought both pearl grey and black rit dye. What dye should I use on the elbow pads and which on the flightsuit?

Also, how long should you die the rothco flight suit to turn the correct grey color?

I’m hearing a lot about this color stripper, what is it and where do I get it?

lastly, do the rothco suits shrink in the wash? should I buy bigger then baggy with the hopes that it will shrink to just baggy? or doesn’t it shrink?

thanks!

ive heard pearl gray on suit, black for elbow pads…i used pearl gray for both, and it turned out fine.