So, Rise is an Idol, which means modelling, singing, acting etc. The first time you actually see Rise is at the very start of the game, she's the girl in the bikini in the Quelorie Magic commercial.
So Rise's whole deal is that because she has all of these different jobs, she's concerned that no one gets to see the 'real her'. Because people get to see Model Rise, or Singer Rise, or Actor Rise, but they never actually get to see her for who she actually is. She's not being herself when she's idolling, she's got all of these different facades that she switches between depending on the situation.
This comes across in her shadow. Now, as you, hopefully, have realised by this point in the game, shadows come across and say "this is what you truely are" and then the characters reject them and they fight, and then they accept their shadow. But one of the most common misconceptions that people make is that the shadows genuinely are what the characters are truely like inside, but that is not the case.
The shadows are what happens when a character's emotions go haywire. They are an exaggeration of a feeling that they dont want to accept. The easiest example is Kanji. Kanji's shadow is this super camp, flamboyant personality that goes around shouting how much he likes men. But that's not what Kanji is. Kanji is someone who is into traditionally feminine activities, sewing, crocheting, knitting etc. And as a result of this, he got made fun of by girls as a kid, so his personality changes, he becomes this hyper agressive, loud, manly man, because that is what he thinks people expect a man to be like. But this personality is one that pushes people away from him. In the end, he thinks that feminine activities cause girls to think less of him. "Oh you like to sew, what a queer" I think is one of the lines the shadow gives. So his shadow manifests like it does because "guys dont say things like that".
In the end, Kanji accepts that this side of him exists, but it was never about men or women, he was just scared shitless of being rejected. But this shadow was the manefestation of an exaggeration of these emotions.
Now, back to Rise, her stripper shadow is in a similar vein. She's 'exposing herself' for everyone to see, because that's what the real Rise want's to do, but in a metaphorical sense, rather than the literal sense of, well, exposing herself. She want's to get rid of, or strip herself from, the multiple Rise's caused by her showbiz lifestyle, and want's the world to see her for who she truely is, or her 'naked' self. In the end, she accepts that there is no single version of 'the real me' and that all of her different personalities were born from inside her. That is what the stripper shadow represents, it's her wanting to cast away all of these other Rise's so that people see who she truely is, but this is manefested as casting away her clothes so that people see the naked self.