An unkempt bob is perfection for caps. The shorter length is low maintenance and isn't fussy or over done. The bob cut has a certain wit and charm that parallels capricorns. A Shoulder grazing length is equally as suiting and not blah anymore, but an actual look. But keep it at the shoulders, below them gets a little..well..hairy.
Looking for something different to do with your hair when you're just bored of wearing it down? A crown of braids is perfect for Capricorns; they mock antlers in an un-assuming up do. You're not the type to follow what everyone else is doing, so get creative with your braids, and get em going which ever way you can. This look can be as easy as making low pigtails and crossing them over the top of your head, securing them with bobby pins.