This is an example of an unstructured green cotton jacket which is a very informal style of jacket. It provides a combination of traditional tailoring but with a casual fabric (cotton) a causal colour (green) and a casual construction. This type of jacket won’t be worn in a formal office environment but would be more appropriate for social occasions. The construction is very lightweight so it would be more suitable in warmer weather. 

Green as a colour for a sports jacket

A green cotton jacket is a colour that works well to signify a more casual outfit. The typical colours for sports jackets that you would wear for work are navy and brown. See this article on sports jackets. A green in a darker, more olive-like shade, can also work though as it isn’t as showy. The green in this example is a bit brighter so is more suited to casual outfits. 

How to design a green sports jacket

As green is a more casual colour, it combines well with a more unstructured construction. This has no shoulder padding or canvassing in the jacket which gives it a looser fitting appearance. Other points on the design are that it has 3 patch pockets and raised stitching. However, unlike a lot of off-the-rack cotton jackets, it has more traditional proportions in the length and the lapel width. 

Styling options

In keeping with the informal character of the jacket, it is worn here with beige and white cotton trousers and a t-shirt. The combination of a t-shirt and sports jacket can be difficult to pull off as they can be too far apart on the formality scale. A fabric like cotton or linen for the jacket is a good idea here as the fabric crumples and creases over time making it look more casual. For example, these linen jackets.

This is also one type of jacket where you can get away with wearing trainers / sneakers such as the Common Projects ones here. 

Other options for pairing this type of jacket include denim jeans.