Just wanted to post a Carmina sizing comparison.
I have some Double Monk Straps in the Inca last (10.5UK) and just received some Tassel Loafers in the Uetam last (11UK).
Both are about the same length wise. The Inca had some room on the sides. I think I can actually size down half a size on the Inca now that I'm carefully comparing it. The Uetam was well-fitting on the sides with maybe 1/8" to 1/5" wiggle room but had a good 1.25" of space for the toe. I'm willing to live with a little tightness on the sides, so I'm sending the Uetam loafers back tomorrow to trade for a snuff suede version in 10.5 and another shoe on Simpson in 10.5. I've heard the Simpson is as narrow as the Uetam, just basically different in the toe (please someone prove me wrong if the Simpson is narrower, before the paypal invoice hits, if needed).
My toe on the Uetam stops where the stitching is on the decorative stitching. FYI. About the same on the Inca.
Bottom point: 10.5 UK Inca = 11 UK Uetam.
Pictures: (Carmina, Polo Cashmere, Epaulet Blackwatch [needs hemmed more])
Inca 10.5UK vs Uetam 11UK (Click to show)