Here are two strong options, both exactly 50 characters:

1. PRETTYGARDEN Women Off-Shoulder Bodycon Maxi Dress (Prioritizes “Maxi” length for filtering)

2. PRETTYGARDEN Women Off-Shoulder Ruched Bodycon Dress (Prioritizes “Ruched” detail, omitting “Maxi” but still implying a stylish dress)

Recommendation: The first option, PRETTYGARDEN Women Off-Shoulder Bodycon Maxi Dress, is generally preferred as “Maxi” is a key length descriptor often used in searches.