Not sure that this belongs in the ita thread so much as maybe a general help thread..?
To start off, Lolita is based in rococo and Victorian, so things were lavish and fine. Well-made clothing was a huge part of those time periods, as well as always being neat, with your petticoats on and your hair styled (or a wig, you should see some of the rococo examples of horrific lice though). If you were of any class at all, you had well-made things. I can assure you, for some of the things these itas have bought, they could have had very nice taobao or second hand burando.
If something is badly made, it shows, and it makes even the cutest wearer look bad. In the case of that photo, her dress and headbow are poorly made with lower quality lace. She's wearing very sheer white tights with some kind of pattern, and sheer tights are normally a no-no. The see-through black gloves just look bad. She would've been better off without wristwear than with those. Her shoes are alright. Her hair is also unstyled. Hair is actually a very important part of a coord.
Honestly, it really does just take learning. You eventually find things more quickly, like bad lace on dresses, mismatched colors, etc. Everyone makes mistakes, even the people here. No one in lolita can look back on their older outfits and not find something that they would change, even if they claim they wouldn't.
>sage for (probably) OT