No, Over The Rainbow is On Yorkville Ave - right in the heart of Yorkville; get off at Bay station.
There is no Below the Belt at the Eaton Centre - it is at Square One in Mississauga...best not get your Sevens there - their selection is not great.
I think your best bet would be to try TNT Blu in Hazelton Lanes, or TNT woman on Bloor St.
UNICUS at Square One has a large selection of Diesel, as it is geared more towards a so-called 'european' denim following....
Also - The Showroom on Queen West might have the kind of jeans you're looking for...actually, a lot of boutiques on the South side of Queen carry high-priced denim labels....
Worth taking a "me day" to check them all out...