Just curious what buckle/fastener type did you get? Here are the types listed on iMore, for convenience:
Which Apple Watch band should you get? | iMore
Here are the 38mm Apple Watch band sizes:
Sport band: 130-180mm, 150-200mm
Modern Buckle: 135-150mm, 145-165mm, 160-180mm
Classic buckle: 125-200mm
Milanese loop: 130-180mm
Link bracelet: 135-195mm
Here are the 42mm Apple Watch band sizes:
Sport band: 140-185mm, 160-210mm
Leather loop: 150-185mm, 180-210mm
Classic buckle: 145-215mm
Milanese loop: 150-200mm
Link bracelet: 140-205mm
Which Apple Watch band should you get? | iMore