Musician Jeff Donna has a simple but well thought out style. His look does consist of too many layers or frill. He gets to the point in how he is DRESSED. In a couple of his looks you can see asian inspirations from time to time. That is his little trademark that works for him. You don't have to guess why.
Do you want to set a trademark for your look? Find an inspiration that you could easily add to your outfits that say "thats him/her". Seek out anything cultural, random or any accessory you have in an abundance are some starting points.