Hi Juju - I'm a similar build, size 10/12, just short of 6ft tall with really long arms and legs and HH boobs (32"chest). I would strongly recommend bravissimo - brilliant company who can fit you in shop but also a good online store, for DD and upwards only. Would recommend an in store fitting as, with everything, the same size in various brands are completely different.
For long leg jeans (34-36") I always buy TopMan mens super spray on skinny jeans, they fit pretty well and aren't super expensive.
HR1