It starts around March or April of every year.  But they
still come as a surprise  A nice one!

They come in multiple colors, shades, and styles-  but the colors
don't matter much

We don't want them long, Shorter is better this time of year

They befuddle a young man,  yet invigorate him

They grab his attention, sometimes too much!

Of course there are different smiles and faces in these

We all have our favorites  But are they not all grand?

What could be being referred to here?

Well mini skirts of course!