Wear clean clothes, e.g. a good shirt and a necktie. Probably you should inquire any young ladies what garments they like a adult male to wear or you should go clothes-shopping with a female person relative or a female person colleagues.
Most-valuable note: A lot of women fix a plenty attention to SHOES.
Don't wear those clothes at all costs even when they are inappropriate or don't suit you. Example: Don't wear a tie and your new shoes while floating.
Okay, this is an exaggeration, but suppose yourself moving bowling and you put on glorious but uncomfortable garments that reach you sweat? Or moving to the pictures with a Hawaiian T-shirt.
On the other hand (since you are awaiting for a girl-friend anywhere) dress up well whenever and wherever you pass. You go buying at? Shave and dress up good! You go to an exhibition? Shave and garb good. You go to a football game match? Trim and garb well!
Other main thought: Woman are usually very "clothes-aware". In fact they communicate thru dress and thru make-up (they put on shorter skirts and more violet-colored lipstick to show they are datable). Hence by wearing well garments YOU establish instantly a communicating line, also.