this is the basic... beanie to hide that the hair is not blond and scarf because they are hot (substitute other clothing items for more stylish ones)
this is the perfect beck costume beanie... also, it looks like beck is wearing lipstick
be sure to surround yourself with asians
a girly, brightly colored shirt is a must
a jacket with it's collar turned up is quite beckish
carry a harmonica at all times
do this when talking to people
In summary: Jeans, or if possible brightly colored pants; feminine, brightly colored shirt; super scene jacket with collar turned up; scarf; beanie; harmonica; asians; strange facial expressions and dance moves; the essence of Beck, which Mr. Daniel Adler already possesses.