Locke to Gogo?

I also can't keep steal off him bcuz there's a time where he NEEDS it in south Figaro...

Well, there are ways around that. You could alter the battlescript so that something besides steal gets him the clothes, like a certain spell or even regular attack, you can get creative there. Also you could always opt to put the steal function on weapons only, or something.

As for hex editing, download Windhex, and look for a tutorial on basic hex editing. There should be some info on how to get started learning how around this site, if you can't find a real tutorial somewhere.