I have a 14 month old too. We wear/carry him in all sorts of devices, including woven wraps and a Poco. He's been a sporadic hair-puller since he turned 6 months old. Toys haven't worked particularly well–they apparently are not enough of a distraction and not nearly as fun as hearing mommy yelp. The hair pulling is worse when he is bored, tired, or hungry/thirsty. So I try to address those issues one by one and see if there's a root cause. Taking a break for snack/water/nursing/potty usually solves it.
I also make sure I'm keeping him fully engaged with where we are and what we're doing. They're very proto-verbal at this age and love to hear the names of things repeated over and over again. "Juniper, Joshua Tree, Pinyon, Yucca, Juniper, Yucca, etc…" If she knows any songs with hand gestures (Itsy Bitsy Spider, etc) you can try singing those while carrying her–encourage her to use her hands (and brain!) in more positive ways.
As one of the other Kat—s mentioned, 14 months is old enough to begin to introduce consequences: if you pull, you don't get a ride. Yeah, it means stopping and putting the baby down, but in the long run it's better than going bald!
In our household my husband has the long hair and I have the short hair, but baby still prefers pulling my hair. Go figure. It may be that your wife produces a more exciting response than you do–if she can stop making "Ouch!" noises, squealing, yelping, it'll probably make the "game" less fun for little one.
When all else fails, I throw a pair of knee socks on his little paws and call them "sun-gloves"–two birds with one stone, you know?
You may want to head over to the forums at thebabywearer.com — the parents over there have a wealth of experience hauling little ones all over the globe in all kinds of ways and I'm sure there are some threads on hair-pulling you could dig up!