FWIW for anyone wondering about sizing a Braided Solo: I was exactly on the line between a 6 and a 7 on Apple’s sizing chart, both in-store and the at-home print out. It was wrapped tightly around my wrist. I bought a Size 5 originally, but it was too tight - exchanged for a size 6 today and it feels perfect. I can shake my wrist and there is no movement, but it doesn’t feel at all tight.
I fluctuate between the 2nd and 3rd largest hole on the S/M 44mm Sport Band.
Sounds like we have identical wrists! I also am in between the 2nd and 3rd largest hole on the S/M, and got a Size 6 for my Sport Loop. It’s a good fit, but I was wondering if a 5 would be better. Nice to know I can rest easy!