Wick Ellerbe said:
IMO, there is no right or wrong here. I use glue on any leather I am going to sew. It makes a cleaner job, it makes it easier. If you want to waste time basting, or whatever, then do it without glue. But, if you can see the glue when finished, then you're just too sloppy with it.
I have to agree with Wick - IMO the only caveat being that when doing period pieces one should also be able to do it in a period method and with only period materials on demand or be honest about your methods/materials.
While I do glue some of my period pieces (mostly on holsters and sheaths) it all depends on the end user - many folks only care about the final look and not the methods/materials, while others want it done using methods and material as close as possible to the originals - of course one can also charge more for the latter since it often takes more time/effort.
The bottomline is be honest with the end user about what you can use/do and when doing perod pieces what is PC and what is not - with each and every end user I discuss the differences so they get to choose.