Steven Seagal alert! To play gruff Capt. Jack Aubrey in the 19th-century seafaring epic ''Master and Commander,'' Russell Crowe pulled his tresses into an era-appropriate ponytail. And style mavens aren't exactly on board with the 'do. ''It totally works for the movie,'' concedes Danna Weiss, who's styled such dapper males as D'Angelo and Jon Bon Jovi, ''because his character has no time for silly things like hair.'' But please, guys, no copycat tails. ''It's so not fashionable it's not even funny,'' sniffs Weiss. Don't let Furio from ''The Sopranos'' hear that.