Here are three examples using a smart design by Orlebar Brown.
1. Business Casual

As the weather warms up, ditch the heavy coats for something much easier and cooler.
The best part is, once you leave the office you can lose the shirt and tie and wear just the “shacket” over the white v-neck t-shirt you should be wearing under your business shirts this time of year (to break the wind and to extend the life of your business shirts by absorbing moisture).

I just remembered that we did another post on “overshirt layering” a year and half ago, seehere.

2. Weekend Sharp

These heavy-shirt/light-jacket mixbreeds are available just about anywhere, at a wide range of price points.
Since you’ll be wearing it with several combinations of pieces, look for something solid and neutral for best versatility – like olive, navy, grey, etc.
A vintage military shirt would work similarly as well - although you may need some tailoring.

Make sure it is fitted through the body and sleeve, with just enough room under for a button-down shirt and a thin layer (like a cardigan, v-neck, crewneck, henley, etc).

3. With the Boys at the Bars drinking Beers

Who said a tee shirt and jeans had to look sloppy?
In fact, in this case it’s actually a tank top and jeans with the t-shirt around my neck (I cut apart some old t-shirts whose necklines were overly stretched and sewed them together into this super-soft jersey scarf).
When it’s wet, but not raining, I usually reach for a rugged lace-up boot. They look appropriate against the wet concrete and there’s no need to leap over pesky city puddles.

sursa:thestyleblogger.com