I haven't got long legs, so I do not know of any retailers who sell such trousers.
However, Nick Robinson Motorcycles on the A33 between Reading and Basingstoke are having a ladies open evening with different clothing in all sizes. It might be worth her (and you if you like) going along if it is not too far.
I received a flyer about it the other day, although I have nothing to do with this personally.
Nick Robinson
He has managed to negotiate for two large suppliers to be at his place for a ladies evening on
4th May
from 6pm til the last person leaves
Each of the suppliers will bring their full ladies range in each size and each colour for you to try on. Any orders will be placed directly with the supplier and the goods will be available within 48 hours. Names will include Richa, Oxtar, Shark, Joe Rocket Nolan and Daytona!
AND AS AN EXTRA INCENTIVE............... NICK IS OFFERING LADIES 10% OFF ANY ORDER PLACED THAT EVENING!
There will also be refreshments available