As I've mentioned before, I'm really into reworking men's button-up work shirts because the fabric is often such lovely quality and it's so nice to sew. Many of them are made from pastel/candy coloured striped or checked fabric, which is very on-trend (if that kind of thing concerns you!) and can look lovely when paired with another fabric with similar colouring.
For these smock tops I wanted to contrast the traditionally male work shirt with an ultra feminine ditsy floral fabric: to play with those different aesthetics within one garment. The pattern I used here was at one point Simplicity 3835, but has been heavily altered and adapted by myself over a period of years. One of the main changes was to make puffier sleeves with a sleeve band. This band provided another opportunity to mix up the fabrics.
The smock incorporates the button stand, pocket and hem line of the original garment. Although the buttons can still be undone, it is not necessary for putting on or removing the finished smock. Here's a whole load of contrast sleeve smock tops which blend men's work shirts with ditsy floral fabric sleeves: