How do you change the colour of socks?

Is there anyway to manually change of the colour of the socks?

bump.

Wait for the next version of REDitor. It will be released in 3-4 weeks.

Is there a way to do it manually?

There isn't because unfortunately the change can't be done via a graphic file. So like Vl@d said, wait for the next version of REditor to change the socks color since it is a value you have to edit inside the roster code.