HEAVY ARMS OR FLABBY ARMS:

When women doesn't have ideal body weight, it is common to have excess fat on your arms.  The choice of dress like sleeveless, fitted sleeves, short sleeves and sleeve styles cannot be worn by them.  Fitness is one way to get rid of flabby arms.

The other way is to give a conscious effort to wear dresses with,

1.  Long tapered sleeves
2.  Extension sleeves
3.  Vertical detailing on center front (as shown in below picture)

This will help move attention from heavy arms.

They should avoid:  Fitted sleeves, short sleeves and raglan styles.

                                              Heavy/flabby arms

Should wear vertical detailing like this would suit female.