I think the above discussion is so valuable for anyone contemplating custom or even significant alterations, because embarking on either means that one has to have really realistic expectations.
Even though I work in a field where things go through a creative process (and I "see how the sausage is made," so to speak), there has definitely a learning curve on my end as far as communicating clearly -- including knowing what questions to ask -- and managing my own expectations.
While my high expectations of the end result have remained steady, I've definitely had to readjust my thinking about how the process "should" go in terms of fitting milestones and timelines.
I admit I have freaked out a bit when something wasn't right at a fitting, but luckily I've worked with people who have described how that's normal etc and the fix is blah blah blah.
Because I'm one of the few to go on record so far with a positive vote for custom or heavily customized, I'll elaborate on what has made that happen.
Anytime I've had a less than ideal alteration or custom *outcome,* it's because I didn't know what questions to ask and the expert (and they are experts, they just aren't mindreaders) on the other end didn't think to volunteer such-and-such a point.
[Quite frankly I've been unhappier with alterations than custom, because to get a truly custom fit with some items has required much more work (read $$$) than desired and/or the changes I authorize don't fix issues that then bother me. Hard to tell that when fabric is being pinned up all around me!]
I do think that most of my custom/customized/alteration experiences have been good for various reasons:
1) I don't go in looking for a direct copy of a certain item (though I have taken in photos and clothing items for inspiration)
2) I make it clear that I am looking for a very collaborative approach where it's ok for me to ask questions *and* desire that the expert share their suggestions or feedback with me -- especially as far as matching textile choice to item desired
3) I am looking for something which "buying up and sizing down" will NOT fix, or not fix without significant cash outlay and no guarantee I will be happy (aka buying a dress to fit the bust but having to deal with oversized shoulders/armscyes)
4) Wanting a specific item in a color and/or fit that is not readily available, or not available at the price point I'm willing to spend (aka a lined mid-weight wool dress with an empire line and then a close-to-the-body fit...in nonblack)
So because I'm going in because I want something "unique" (for lack of a better word), and am willing to talk about how I like clothes to fit my body and what shapes work best for it, AND have asked for input what items would work best with my fabric or what fabric(s) work best for my desired item, I've been very very satisfied.
[And I also like supporting small businesses and cultivating relationships with local people, so that's a bonus too!]