Can you be more specific please?
Sounds casual. In that case I'd go with some moccasins. Cole Haan driving mocs are fairly sleek and would go well with the skinny jeans. Get a pair that aren't distressed ...they'll look a bit dressier. Or you could go with a pair of Sperry Topsiders ...aka boatshoes ...but are really just moccasins. Very classic look and gives a bit of the prep look ...especially with the blazer. Okay, a little off the wall, but a nice (new) pair of low cut Converse All-Stars. Lotsa colors to choose ..maybe a grey to go with the blazer or medium blue. Kinda avant-garde look ... I'd go with the mocs; either the drivers or Topsiders.
simple heels
Tan or light brown brogues