Several months past by, and you find yourself in need of a black formal shoe. You go through the same approach, getting the same salesperson, hoping- no, actually pleading silently in your head- that the size for the earlier semi-dark shoe would give a close enough approximation to the size in black formal shoe. And that this close enough approximation would minimize and trial and error this time. However, by now the sales person is hanging her head low, a pretend dejection in full self defense against your wrath, as she explains that the semi-dark shoe size is a lot closer to the first light colored shoe than to the black one.
The thought of stabbing in the dark for this black shoe as more daunting- inspite of your previous two daunting trips- makes this maddening process a woeful understatement.
As if there isn't any more pain to the injury, another wrench is thrown into the picture where you cannot try the shoes and 'test' drive the different sizes unless you pay for them. And that the store may or may not take back sizes that don't fit in exchange for a fitting one.