Nope. Outrage of modesty is up to the "victim's" personal feeling. If the victim felt she has been violated for whatever reasons, she can pursue the matter. But whether her charge will stand in court is another matter. Because the ruling will be based on evidence presented and an actual outrage of modesty actually occured given the evidence and the standards of recent precedents.
The offence created in s.354 "outrage of modesty" or otherwise commonly known as "molest" is not even applicable to this case

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Btw actually outrage of modesty is not "up to the "victim's" personal feelings."
s.354 Penal Code is actually more concerned with the intention of the accused not whether the person molested was actually aware of it.
Take the example of a 9 yr old girl , Jane , John , a dirty chee ko pek sees Jane and takes the oppotunity to rub his groin against her shoulder in the lift.
Jane is unlikely to know that her modesty is outraged. He can be charged under this section.
For indecent exposure, your friend probably is not involved in indecent exposure as judges will look at the norms in society to decide the standard, and looking at current norms and trends now, i guess asscrack showing is so common that half the population of singapore girls will have to be arrested if she does get charged for indecent exposure.