What is your preferred clothing/hairstyle combination ?

Depends on which PC I'm playing at the time, as I alternate between the male and female PC, depending on my mood.

For the male PC:

Hair: I go with either turquoise, blue, or white hair in messy ponytail (to match my own ponytail, albeit mine is black).
Eyes: Usually brown, blue, or green.
Top: I go with either the Fancy Kimono Cyndaquil, Basculegion, or Sneasler.
Pants: I go with either the Fancy Bottoms Mountainscape, Typhlosion, or Honchkrow.
Footwear: I go with either the Ninja Footwear (Crimson) or Diamond Clan Boots.

For the female PC:
Hair: I go with either turquoise, gold, or violet in either the Survey Corps Style or tied back, sometimes with a scarlet or azalea headband.
Eyes: Usually blue or green.
Top: I go with either the Fancy Kimono Typhlosion, Braviary, or Seascape.
Pants: Either the Cropped Bottoms (Scarlet), or the Fancy Bottoms Liligant or Basculegion
Footwear: I tend to stick with the default Sandals.

For both PCs:
Outfits: Bandit Outfit (Sapphire, Crimson, or Blue Spruce, depending on mood).