
from 1:57, the plan
from 25:00 they need another woman. Just listen to what they say. They strip the dead fake widow and look for a "respectable" girl
from 35:35 they "persuade " the respectable girl ( found at the local saloon ) to wear the stolen dress
oh come on watch the movie

and YES western movies are"History"

https://www.dailymotion.com/video/x2q805w