purely for the sake of discussion here... no argument intended (i.e., civilized conversation - i know how things get on here).
for me personally, it's not about whether a suit is pimp or looks catchier or whatever, it's whether it gives the most memorable and iconic portrayal of the character, e.g., i have vince and jules in their "boring" black suits because that's what i equate them with most. i think the end plainview result is actually much more eye-catching than the charcoal suit but i (personally) always think of plainview in the charcoal suit.
for doc, the ringo duel scene was a great scene, but it's not really iconic doc. doc was the quintessential smooth-talking dandy. most legends have portrayed him like that and that's how i would have preferred him to look.
but everyone collects for different reasons and likes different things. i can see that