Shirt : I wear shirt Monday to Friday, can try shirt with some fine details like brighter colour stripe, contrast thread colour around button opening or double collar button
Pants: Polo, M&S, Nautica, all have good chinno style slack. A new brand Club Monaco, a little more pricy but very nice too
Shoes: Loafers - any brand will do, personall favorite is TODS, but $$$$$$$$$$$$ ......... Sport shoes are generally too casual if just switch from formal to smart casual