Solovair Greasy 8 Eye Derby Boots

Solovair Greasy 8 Eye Derby Boots in UK 5 which translates to US 7 women and US 6 men. I am typically US 8.5 women but US 8 in boots. These are too small for me, there was a sizing error on the website which led me to believe these would fit me. I've worn them a handful of times and they aren't fully broken in yet. I would say they would fit a US 7.5 - 8 women. I would likely size up .5 to replace these.