فَذَالَتْ كَمَا ذَالَتْ وَلِيدَةُ مَجْلِسٍ
تُرِي رَبَّهَا أَذْيَالَ سَحْلٍ مُمَدَّدِ
Meaning: The she-camel moves with a flowing, swaying gait, like a young serving woman in a gathering displaying the long trailing edges of a spread white garment to her master.
Dhālat describes swaying or moving with a long, flowing motion. Walīdat majlis is a young female servant in an assembly. Adhyāl saḥl mumaddad evokes the trailing edges of a long, extended white garment. The relevant comparison is the sweeping movement, not a literal human appearance.