I'll keep an eye out - I've seen some cute ones in Cars prints etc... and the minkee ones are fab, you wouldn't get any wicking with a shorty-style wrap. Let me know what your budget is!
Here are some links for the style of thing (expensive new but they do come up used fairly often
): http://www.lemonde-delili.fr/product_in ... dc6023aa12http://www.lemonde-delili.fr/product_in ... cts_id=215http://www.ideal-nature.fr/product.php?id_product=20http://lescherigogottes.fr/index.php/la ... duits.html
The Lili'Shorty and Lili'Shorty'one (those have a pocket so you can stuff them and use them as an AIO, but I just use mine as a wrap) run a bit small, I'd probably go for an XL if Nathan has chubby thighs.
Ideal-Nature is what used to be Harmony; these are fab particularly for nights and the large runs pretty big. She does a 3-pack for 42,90 € + p&p ... the shop seems to be open although usually getting a slot is a seriously difficult affair!
I've heard Cherigogottes run big-ish but haven't tried them.