I ordered a size up in the "old Dres" -- and took a 27 from my usual 26, for a slightly slouchier look. (Right now they are a lot less slouchy, but let's not go into that issue, ahem.)
Anyway -- I actually ordered my regular size 26 in the burgundy. They haven't arrived yet, but my reasoning was as follows:
Truefit told me that is my size and the last few times I ignored Truefit, I was sorry.
AND -- the fabrication includes more stretch than my original Dres, which are 98% cotton and 2% heaven-only-knows-what. In jeans that have more stretch, I invariably prefer my regular size (or even a smaller size).