I am Muslim and know that this is wrong in so many ways, i dont even know where to start.
Firstly men are not supposed to stare at women, so these men should not be noticing and inspecting whats underneath a womans gown
Secondly they aren't even dressed islamically themselves, they are wearing tight trousers. Men must cover from between navel and knee in loose clothing. As far as i can see, they haven't even got a beard which is another islamic ruling for men. Men should have a beard. So how dare they do this when they cant even sort themselves out. And laughing! Prophet Muhammad (peace be upon him) would sort these guys out i'm sure of it.
Also, there was an incident during the time of the Prophet where a woman fell off her donkey and her body wasnt exposed because she was wearing shalwar (baggy pants) underneath her gown. He said 3 times
" O Allah forgive the women of my Ummah (nation) who wear the shalwar. O you people, use the shalwar for it is the most concealing of garments and encourage your women with it when they go out."
There is one thing though, men are not allowed to wear mens womens clothing and vice versa so they are probably classing trousers as mens clothing, thats probably their excuse for doing this.