I often have people asking me my opinion in regards to wearing kimono without ohashori. It’s also a question often asked on my forums - with this particular thread being the main one:
http://www.immortalgeisha.com/ig_bb/viewtopic.php?t=10273
My opinion is - I prefer to wear a kimono I can get an ohashori out of - it’s just a lot less stress when dressing and also helps the kimono sit nicer. And, being 165cm tall - not awfully tall, but tall enough - it’s always nice to have kimono that fit “properly” without having to worry about “faking” the ohashori or forgoing it completely.
HOWEVER
I collect kimono specifically from the Greater Taisho Era…which can make it awfully hard to find kimono long enough to create a proper ohashori, or even to fake it for that matter. These kimono are often so gorgeous, and in amazing condition for their age, it is such a shame to not wear them just because they are a tad short. So I often wear kimono without ohashori and have done so for quite a few years. Some of my ohashori-less ensembles:
http://www.kimonoasobi.com/?p=102
http://www.kimonoasobi.com/?p=101
http://www.kimonoasobi.com/?p=76
Okay, well - to say I go completely without an ohashori would be a fib. On a technicality - I do wear ohashori with these kimono - but it’s so tiny and hidden under my obi you don’t see it. Unless you are super slim, the likelyhood that you could get away with wearing kimono with absolutely no sort of ohashori is narrow, as you need to be able to adjust the kimono to sit nicely over your derriere, hips and thighs. An ohashori, even the tiniest of one, allows for the adjustment of fabric to make it look right.
Misuchi of Kimono and Kitsuke recently was lucky enough to meet Mamechiyo-san and discussed with her kimono as daily wear - and touched upon the no ohashori issue:
http://kimonoandkitsuke.blogspot.com/2008/09/every-day-kimono.html
As you can see - even Mamechiyo-san has the same opinion!
Along with what Mamechiyo had to say, I’m seeing more often than not in kitsuke coordinate books and blogs focusing on antique and vintage kimono women wearing kimono minus the ohashori. And just yesterday, I received a new kitsuke book that has instructions on how to wear too short kimono!

Flickr link for full sized scan:
http://flickr.com/photos/kimonoasobi/2935115022/in/set-72157607958553262

Flickr link for full sized scan:
http://flickr.com/photos/kimonoasobi/2935116128/in/set-72157607958553262
With all that said, to ohashori or not? As long as your kitsuke is impeccable (which shows the lack of ohashori was a conscious choice, and not a mistake) - you should be fine. There’s no point letting those gorgeous pieces of art sit in your closet, never seeing the light of the day again, right?
So I say, GO FOR IT!
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Book information:
きもの入門 - きものの基本がよくわかる
Online translation of title:
“A guide to a kimono The foundations of a kimono are known well.”
ISBN 4-418-05305-0