Question about sizing

[Abbyguy]

Hey guys,

I recently won a couple speedos off eBay and the seller messages me after auction end that the speedos I won laid flat are about 12" and 13" across. What would that be in overall waist size? I am doubting these are going to fit me as I am a 32" waist and the seller has given me the option to opt out of paying as she listed these as a men's size small and medium.

Thanks in advance for your replies.