Symmetry: the correspondence in size, form, and arrangement of parts on opposite sides of a plane, line, or point.
Sometimes it is helpful to consider elements of style idiom singly; symmetry is one such variable. While some suggest symmetry (or asymmetry, for that matter) is somehow preferable or “better”, I think it a matter of personal preference. And I prefer it.
For years, and for no real reason, I wore my hair parted more or less on one side. Recently, though, I had the thought to have my stylist cut it to be worn more symmetrically, not with a straight center part but balanced, with a messy or almost-nonexistent center part. We decided it was definitely me. Since then, as I have been experimenting with headbands, it occurred to me to employ the principle of symmetry in where I put the knot. Directly on top is fun! (But then my bangs need to go to the side in order to not go in my eyes.) 
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Various thoughts present themselves as possible reasons for a preference for either symmetry or asymmetry:
- level of facial or body symmetry
- preferred degree of formality (symmetry may be more formal)
- activity level (asymmetry may convey more activity)
- others?
In general, I prefer symmetry, but not perfect symmetry. I don’t always remember to apply the principle. Could that be a contributor to my occasional wardrobe trauma?
Just read some article about people judging symmetrical faces as more beautiful. Makes sense. I have an asymmetrical face and tend toward a side part but I do love symmetry in my clothing – a lot. I would think that a lot of wardrobe trauma could be headed off with strong symmetry because it makes it look so in control and absolutely intentional. Most people will bow to others who seem to know what they’re doing.
On the other hand, once you add a handbag of any style (clutch, satchel, crossbody, backpack on one shoulder) there goes the symmetry. 😀
So, I have heard the “symmetrical faces judged more beautiful” thing too (I think in Nonverbal Communication class), but I am not so sure. Are there not great, exotic beauties with asymmetrical faces? And are there not people whose faces are symmetrical and yet seem a little boring? Idk. I know they have studies, but there is alot they don’t know.
The handbag issue may be the real reason I am itchy about handbags! I am often trying to get them to blend into the skirt portion, say, and not to be “popping.”
Oh, that’s interesting!