It isn’t in the Nadir - before you first enter you are asked for a Ray-drenched Cinder and there are a number of options to get one. One of those is Fate and that gives you the Robe.
If you have already entered the Nadir Robes are only available from getting a Master to clear your path when it is Snowbound.
By the time 400 Echoes is easy, you’re closer to end-game grinding, not Nadir entry. It’s better to grind 100 Revolutionary in the FQ (and mitigate suspicion) than grind 400 Echoes for a 115-120 Modified stat person.
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Well I suppose I do have a habit of hoarding, and I also tend to advocate the idea of non-attachment when needed. I sold a lot to get the 400 echoes, but at the end of the day it didn’t make much of a difference. I sell things I’ll need in the future and worry about the problems that will create later, but if you’re smart and patient, yeah, that’s definitely the best choice.[/li]