Depends on the situation.
For more formal, you can’t go wrong with grey. I also really like burgundy, navy, black, and tan.
For casual wear, most colors/patterns (even loud ones) can look good.
It’s tough to answer this because I don’t know your relative leg size but if you want maximum shrinkage go hot soak, hot dry. Although I wouldn’t recommend the dryer, as it gives you really weird creases and fading.
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With mustard shoes, you probably want to stick to earth tones, neutrals, and complimentary colors to yellow. Green, brown, tan, white, navy.