im 5ft 3 and i have a pair of kyra k breeches....very comfy...but the velcro does up around my ankle
i am just about thin enough to fit in the biggest kids size but [and i dont mean this to sound as dodgy as it does!!] they arent deep enough around the crotch i find!! which makes things very uncomfy. plus my fat arse peeping out of jods is just not something people will want to see!! shame as kids ones are cheaper!
I bought some Shires Saddlehuggers casuals and I think they are great. I am 5.2 and they are perfect length on me and really comfortable to ride in. The casual style is not as unflattering as traditional jods/breeches. See http://www.shires-equestrian.co.uk/cgi-b.../14.0.82.1.34.1 for info.
Also about 5'3" and wear Mountain Horse Isolde breeches all the time. Just the right length, and although not brilliant, are not bad with just short boots too!