I doubt they'ld make them bigger to accommodate thick socks, Perhaps try them in a tack shop with thick socks on? So then you know they do fit your big socks
I get really cold feet so need extra socks! They don't have a massive range in my tack shop so was going to order online but will still bob in and try some of the ones they have and see - thanks both
Try the robinsons's catalogue, they have these boots in the book and state they are a 'larger fit' (Requisite make) They may be big enough for your socks!!!!
I try and get them a half size bigger for this reason Though in winter I tend to go with those long rubber riding boots because they're really warm, waterproof and easy to clean with a hose Short boots I save for the summer xx