You cant dress "sexy" other than at nightclubs and bars. Its not cheap and being easy. Some girls do look cheap because they come from low income families and work at dead-end jobs with no education past secondary school.
When i was 16-17 i used to go to local towns/malls dressed in bodycon mini skirts from mid-thigh to just about showing the bottom of my bum cheeks, with knee high boots, high heels, (sometimes) platform 6" high heels, because ive always had nice looking legs. Sure i used to get the odd looks from some people but a lot of other people gave us the attention me and my friend was looking for.
Some girls really didnt like how we were dressed, its not like we looked cheap either. Having fit guys checking us out ALL the time worked great for my confidence. Seeing guys with their girlfriends eyeing us up, looking back to see if he looks back to check us out, giving him the eye/smile as he walks past with his girlfriend giving the dead eye. Then we started going to nightclubs so we just lost interest for flirting around town.
Most people on this forum dont seem at all interested in it all, as if its a horrible way to dress the guys just dont like it. Yet pretty much all guys ive ever been out with have liked it when i dress "sexy" or slutty as people on this forum call it, some have even bought me a dress to wear for when im out with them... some very revealing dresses id *never* wear around town in the afternoon..
Just never ever go commando with a very short mini dress on, its more hassle than its worth.