Ok so, The Troy movie is not amazing and has a lot of issues as a retelling and it's understanding of the characters. BUT the armor for a lot of the characters is WAY better than anything I've seen from The Odyssey set and I think what separates them is the pattern and ornamentation as opposed to the flat armor.
Armor and clothing are just as ingrained to culture and history as the layout of a kingdom.
Hell, if anything, the armor should be THE MOST detailed because the Iliad/The Odyssey were super descriptive of the making and layout of various armors, weapons and shields of the royal figures.
I can only come to two conclusions of why Christopher Nolans Oddsey looks so bland outfit wise.
Either there was some finaical issue with the costume department.
Or that they're going for a "grounded" take on The Odyssey and Greek Mythology and almost try to modernize it but it's just going to end up misrepresenting the source material and culture it's linked to.