I'd highly recommend Darksidecloset for your soft goods, they can take care of everything soft goods related (including screen accurate sourced gloves) except for the boots, belt/bandolier, and leathers. The wait can take a bit, but they are really good with communication, so it's not so bad, anyone building a Fett or Din knows they're not fast builds anyway.
I second the recommendation for Crowprops on the boots.
My leg leathers are from Delta Leather Works and they're amazing.
My belt/bandolier came from Sines Industries but they went suddenly radio silent a while back, however I have seen a lot of people recommending Debora Di Meo's work, she can be found active on the The MANDALORIAN- Din Djarin Costumers Guild facebook page (The MANDALORIAN- Din Djarin Costumers Guild | Facebook), she also has great how-tos on her youtube channel here: https://www.youtube.com/@DEBORAdiMEOcosmaker/videos.