Sleeve pictures are in order of descriptions below.

Sleeve Option S1 - Sleeves taper from fullness at shoulders to suit coat width at wrist. Unlined.
Sleeve Option S2 Double bell sleeve. Traditional bell outer sleeve with inner sleeve and elbow cuff. Default sleeve for this robe.
Sleeve Option S3 Sleeves taper from fullness at shoulders to 14" opening at wrist. Unlined. As shown on style 4442S
Sleeve Option S4 Single bell sleeves are machine gathered onto a knit cuff. As shown on style 4851KC.