Thanks peter980_1 and Eldricus. That does seem to be the problem.
stripe6499 sent me pre-made folders he created himself and they work. Each folder now has nine digits, for my 9 defined clothes in the properties file. This means there's a 10th folder with all 0s which I found out I can use for a 10th 'finale' image using the finale.properties file, if I want to.
Thank you everyone!