Yes, there are some general principles and you have pointed at a couple of them:
- white shorts go with almost anything
- black shorts are unfortunate with anything, but the black dominated shirt or monochromatic outfit (i.e. black-white)
- black socks are almost always a worse choice than something else
For example, see this:
That combo, while not terrible, is made instantly better with white socks. Obviously the main problem are the shorts: they should be white. Even citrus yellow will look better than black. Black is too stark here and doesn't compliment the otherwise stellar shirt and shoes.
Reversely. Here black shorts are almost inevitable (notice the white socks and shoes that lighten up the whole thing):
I agree w/some of what you said and respect the thought that went into it.
Also, we are mixing settings; my rules for the court are different than my rules for everything else.
If I'm wearing white tennis shorts, I need white socks and sneakers too. I hate the look of white socks with colored shoes, outside of neon orange or yellow.
On-court I try to have my shorts+socks+shoes match
My absolute pet peeve is white socks with black shoes, awful on-court and even worse off-court.
I tend to stay away from black, period. I think it's boring, and unflattering on most people.
Title. I sometimes feel gaudy or drawing attention to myself for even wearing a shirt with a different colored collar, let alone a collared shirt. I like how I look, especially when I have a slight bit of a beard, but it feels like I’m trying to look important.
Can't say I share this concern. I have a ton of Polo shirts in very vibrant colors. Yellow, orange, purple, bright blue-green, white. I also got made fun of a lot in college and afterwards by my friends for having 'douchey' or country-club style, but that's my style. I'm not that guy wearing black t-shirts with jeans.
I also make it a point to contrast, so a blue shirt with jeans is an absolute no-no, as is a yellow shirt with green pants, or a lavender shirt with maroon pants.
You know that Babolat bag we have? Everything in it is white, with a few tops in very light colors (neon orange, neon yellow, and light green). That's my bag for daytime outdoor matches. Anything darker than that makes me too hot.
My older bag is for night matches, indoor, and winter, so everything in that bag is some kind of blue or grey.