It would be helpful if you could be a little more precise regarding sizing (I know it is not necessarily something you want to share but honestly it would help).
Let me start by saying I am actually a lady of approx size 16/18, I am not blessed in the boob department and I am approx 5' 11" tall. This gives you some idea of my size - so now I will let you know what I have to offer as advice.
I have found the all in one body stockings to be fine in every aspect including length.
These are some that I have :-
http://www.lovehoney.co.uk/product.cfm?p=32648
http://www.lovehoney.co.uk/product.cfm?p=29113
http://www.lovehoney.co.uk/product.cfm?p=29845
http://www.lovehoney.co.uk/product.cfm?p=33178
http://www.lovehoney.co.uk/product.cfm?p=30695
You will notice that some are one size 6-16 and they still fit.
I also have the following:-
http://www.lovehoney.co.uk/product.cfm?p=34604
http://www.lovehoney.co.uk/product.cfm?p=33064
http://www.lovehoney.co.uk/product.cfm?p=29166
http://www.lovehoney.co.uk/product.cfm?p=32666
Again some in plus size and some one size. You just need to check out the individual size charts and go from there.
I also have 'tummy issues', but can say that I feel pretty good in all of the above, and a certain hubby appears to agree too!
I hope this helps - and remember, LH has a great returns policy, so if you find you order the wrong size, or you just aren't happy with the look, you can exchange or return.
Good luck, and happy hunting xx