In the Change Skin section for Java Edition, the selection of capes contains “No cape”, which is left untranslated. If it's a translateable string, it could be rendered as “Nessun mantello”.

There's also “Migrator” cape, which could be translated as “Migratore” or “Migrato”, the second one less literal but possibly nicer to read.

Addendum: someone let me know that capes which have their names composed by multiple words also lack spaces between them.