Formalgownaustralia.com listed some long fromal dresses with pockets online,you can find them here

A-LINE ASYMMETRICAL LONG BLACK SATIN CHEAP FORMAL DRESS ONLINE WITH POCKETS

Views: 8Product Code: FOR2019051512
Availability: In Stock
$108.00

A-LINE FLOOR-LENGTH LILAC SATIN V-WIRE NECK FORMAL PARTY DRESS WITH POCKETS

Views: 4Product Code: FOR2019051614
Availability: In Stock
$108.00

A-LINE FLOOR-LENGTH V-NECK EVENING DRESS FRONT SLIT ZIPPER BACK SLEEVELESS FORMAL PARTY DRESS WITH POCKETS

Views: 4Product Code: FOR2019052045
Availability: In Stock
$116.00

A-LINE JEWEL-NECK APPLIQUES FLOOR-LENGTH RED FORMAL EVENING DRESS WITH POCKETS

Views: 4Product Code: FOR2019051511
Availability: In Stock
$126.00

A-LINE ONE SHOULDER TEA-LENGTH POCKETS SEMI FORMAL DRESS

Views: 5Product Code: FOR2019051510
Availability: In Stock
$102.00

A-LINE SWEETHEAR SLEEVELESS PINK SATIN PRINCESS FORMAL DRESS WITH POCKETS

Views: 9Product Code: FOR2019052005
Availability: In Stock
$130.00