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I read somewhere that Paul started to grow a moustache first in 66
then the rest of them followed the trend.. i dunno..
They certaintly got very hairy as time went on! 
That's why Paul started to grow his but George claimed that he started to grow it before he went to India ...
from their Anthology Book:
"RINGO: THESE LITTLE SLUGS WERE GONNA TURN INTO BUTTERFLIES.
PAUL:
I had an accident when I came off a moped in Wirral, near Liverpool. I had a very good friend who lived in London called Tara Browne, a Guinness heir - a nice Irish guy, very sensitive bloke. I'd see him from time to time, and enjoyed being around him. He came up to visit me in Liverpool once when I was there seeing my dad and brother. I had a couple of mopeds on hire, so we hit upon the bright idea of going to my cousin Bett's house.
We were riding along on the mopeds. I was showing Tara the scenery. He was behind me, and it was an incredible full moon; it really was huge. I said something about the moon and he said 'yeah', and I suddenly had a freeze-frame image of myself at that angle to the ground when it's too late to pull back up again: I was still looking at the moon and then I looked at the ground, and it seemed to take a few minutes to think, 'Ah, too bad - I'm going to smack that pavement with my face!' Bang!
There I was, chipped tooth and all. it came through my lip and split it. But I got up and we went along to my cousin's house. When I said, 'Don't worry, Bett, but I've had a bit of an accident,' she thought I was joking. She creased up laughing at first, but then she went 'Holy...!' I'd really given my face a good old smack; it looked like I'd been in the ring with Tyson for a few rounds. So she rang a friend of hers who was a doctor.
He came round on the spot, took a needle out and, after great difficulty threading it, put it in the first half of the wound. He was shaking a bit, but got it all the way through, and then he said, ''h, the thread's just come out - I'll have to do it again!' No anaesthetic. I was standing there while he rethreaded it and pulled it through again.
In fact that was why I started to grow a moustache. It was pretty embarrassing, because around that time you knew your pictures would get winged off to teeny-boppery magazines like 16, and it was pretty difficult to have a new picture taken with a big fat lip. So I started to grow a moustache - a sort of Sancho Panza - mainly to cover where my lip had been sewn. It caught on with the guys in the group: if one of us did something like growing his hair long and we liked the idea, we'd all tend to do it. And then it became seen as a kind of revolutionary idea, that young men of our age definitely ought to grow a moustache! And it all fell in with the Sgt Pepper thing, because he had a droopy moustache.
I was originally trying to grow a long Chinese one, but it was very difficult. You have to do a lot of work waxing it, and it takes about sixty years - I never did get one of them.
John had a moustache cup. It had a little hole underneath the lip so you could drink tea from it without getting your moustache in it --rather fetching!
RINGO: Growing moustaches was just part of being a hippy: you grow your hair, you grow a moustache, and in my case you grow a beard. That was the Sixties coming to the fore.
I always hated shaving anyway, but the moustache was not special for me. The moustache was growing and the beard was growing - hair was growing. It was just part of the set. We were gradually turning into Sgt Peppers. It was as if we were going through a metamorphosis.
NEIL ASPINALL: Their appearance was still changing - moustaches and so on - but it was nobody's decision. It was just everybody influencing everybody else. Somebody would come in with something new and the others would go 'That's nice. Where did you get that?' It was like that. Occasionally Paul used to disguise himself when we were on the road. He and I would go out into the audience, up the stairs and into the gallery or the circle with all the fans, watching the other acts that were on the show. Paul would have his hair back and a moustache, glasses, and an overcoat on, and nobody would expect him to be there so nobody took any notice.
When he was in the Wirral, Paul had a moped accident and he grew a moustache to hide his split lip and, because he had a moustache, the next thing everybody's got one. That's how it happened for me, anyway. That's my story. I had a moustache, too.
GEORGE: Moustaches were part of the synchronicity and the collective consciousness. What happened to me was that
Ravi Shankar wrote to me before I went out to Bombay, and in the letter said, 'Try to disguise yourself - couldn't you grow a moustache?' I thought, 'OK, I'll grow a moustache. Not that it's going to disguise me, but I've never had a moustache before, so I'll grow it.' If you see the photographs of the Sgt Pepper sessions, we've all got funny things happening and hair breaking out on the face. And then everybody had a moustache; I think even Engelbert Humperdinck got one.
NEIL ASPINALL: The band at this time started to appeal to a more turned-on audience, because they themselves were turned on. Brain loved it all. He had great faith in The Beatles and what they were doing, and loved them as a band, as musicians and as artists. Brian was a fan. They influenced people right from the very early days, when everybody suddenly seemed to have collarless jackets and Cuban-heeled boots and Beatle haircuts. That influence always seemed to be there.
JOHN:
That bit about 'we changed everybody's hairstyles' - something influenced us, whatever was in the air. Pinpointing who did what first doesn't work. We were part of whatever the Sixties was. It was happening itself. We were the ones chosen to represent what was going on 'on the street'. It could have been somebody else but it wasn't: it was us and the Stones and people like that."
