I am a true Women's SIze 6 1/2. I ordered Big Boys Size 5 Clogs and they fit SNUG (can get away OK barefoot, but too small with socks). In women's Happy Goh clogs, size 6 is tad short, and size 7, tad long for me. I think  Women's size 6s would find Boys SIze 5 Clogs a perfect fit. I didn't want to chance it, so I kept the Boys Size 5 CLogs instead of returning them for Boys SIze 6.
TRY Kids, it's cheaper and no different in quality to the adults.