Fortuna chose this particular costume for another reason. On Ryloth, in many of its lower districts, Twi'lek women worked as prostitutes and performed in seedy strip clubs in the same cheap netting she now wore. By forcing her to wear it, Fortuna was showing Oola that like the women in these clubs, she was now a low cost Twi'lek whore that could be easily replaced if she was not obedient.
Oola hated her costume and what it represented but knew her only other option was to forgo clothing altogether and remain naked before the Hutt. Not wanting that she kept the costume and often tried to cover herself by pulling her legs close to her body or covering herself with the pillows Jabba provided.
Jabba dressed Oola in the netted costume to show she was very low cost, and as such could be replaced at any time. He loved mouthing over her skin and watching her feminine assets as she danced. She was not given any underwear to wear with it, so that he could watch her breasts and buttocks bounce around, barely restrained by the cloth. Seeing her in this costume, half-naked and accentuated by the nets, aroused him and made him desire her even more. Another purpose of Oola's outfit is that it makes her feel cold and dirty so she would forced to cuddle with Jabba's grimy body to keep warm. The open space in the crest area would allow Jabba to stick his face between her breasts.
Oola hated wearing the outfit as it made her look like a whore to everyone watching. Her crotch was at least covered, but her large breasts and her buttocks were not restrained in any way, allowing them bounce or shift whenever she danced. They were barely obscured underneath her costume, and much of her time was spent trying hard to dance without exposing her breasts or buttocks to the crowd or Jabba. It's sparseness also left her exposed to the cold nights of the palace, causing her nipples to become erect and easily visible through her mesh. It was a simple outfit to remove, which it often was, either during her many strip teases on the dance floor, or by Jabba when he desired more than just dance. She felt humiliated wearing the headpiece, as it was very uncomfortable and mocked her heritage as a Twi'lek. All of these things made Oola despise the costume and what it meant-that she was a sex slave to be used only for pleasure.
MangaEditIn the manga, the top half is stretched from her large breasts, leaving them to bounce around and her cleavage spread wide open. The stretched outfit is pulled from the body, in the style of a sling bikini.
This version of the outfit lacks the cloth that covers her pelvis that acts as her panties, completely exposing her crotch and ass so the whole court can watch her dance bottomless.
These features are only shown while dancing, and not while sitting where she can cover it up.