I wear a 27 in TR but what about R&R rebecca?

There is not a store by me where I can go try on...maybe I will order a 27 and 28 and see which one fits. I think the 26 would be way too small! I dont think I have ever worn a 26!
 
I think it depends on the material. I wear a 26 in TR and I can wear anywhere from 25-27 in R&R depending on the material. The not so stretchy ones I wear a 26 or 27 and the stretchy ones I wear a 25 or 26.
 
R&R is not consistent in sizes... at ALL. I have a pair of berlins that are tts, a pair of nirvanas that run small, and a pair of jaguars that run big. Your best bet would be to go try them on, or ask on authenticforum where all the denim experts are.