I think "one-piece mocassin" or "soft-sole mocassin" should work. It basically means that one piece of leather was stitched to form the shoe, i.e. it's not made by sewing an upper to a sole (which would be a loafer).

Here's a definition:
moccasin, skin shoe worn by indigenous people of North America, excepting the sandal wearers of the Southwest area. There were two general types of moccasins, the hard-soled, which was used in the Eastern woodlands and the Southeast cultural areas, and the soft-soled, used in the Plains area. The hard-soled moccasin was made by sewing, with sinew thread, a rawhide sole to a leather upper piece; the soft-soled moccasin was one piece of soft leather with a seam at the instep and the heel.

The Amazon link also has pictures of this type of workmanship.

Italiano term (edited): mocassino tubolare

La differenza è questa:
in italiano mocassino può essere:
1. quello che somiglia alla calzatura degli Indiani d'America
2. significato esteso di calzatura moderna, maschile o anche femminile, con tomaia di cuoio morbido

Più precisamente, il mocassino somigliante a quello degli Indiani si chiama mocassino tubolare o real mocassin
http://www.parentisrl.it/Generale/COLLEZIONEDONNA.htm

Il mocassino inteso come calzatura con tomaia di cuoio morbido può avere i lacci o meno e in ing. si traduce con "apron front shoe"
http://www.maintenancesupply.co.uk/item320.htm