I am a 'true' size 10 and the size 41 fit me perfectly.  Clogs are supposed to be a bit big so don't be surprised if there's room to spare, the top strap will keep them in place.
I got the Hawaiian Red color, which it a neon coral with shades of mauve.  They are super cute and the price is AMAZING, but how often can you wear that color?  For me not often so I went to a local craft shop and got a small bottle of Tulip Soft Fabric Paint like this&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Tulip-29377-Soft-Neutral-Fabric-Paint-5-Pack/dp/B009F9I0Z4/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Tulip 29377 Soft Neutral Fabric Paint, 5-Pack</a>
The one bottle was less than two dollars.  I chose Night Sky which is a very dark grey (or soft black) with sparkles in it.
My seven year old daughter and I painted them this morning and they look fabulous.  I'll post a picture so you can see how cute they are.