The keywords of sleeves for NATURAL type are
CASUAL and VOLUME
NATURAL type’s sleeve keywords are casual and volume. Volumes around their shoulders or arms like Batwing sleeve or Dolman sleeve are best for NATURAL type. They can wear on casual items the most stylish than other types.
Cuffed shirt sleeve
･Short length like 3/4 sleeve or cap sleeve
･Feminine decoration like frills or gathers