The OPEN COLLAR SHIRT - LINEN TWILL is a signature classic item from Nigel Cabourn. This season, many items have been released with different materials and patterns.
The one I wore this time was the most basic and plain pattern. The Charcoal Grey in particular goes well with military pants, and I can confidently say that there is no pattern that doesn't pair well with it.
As the temperature rises, you'll probably start wearing your shirts open more often, and that's where a Henley shirt comes in handy.
Just this one accent around the neck gives off a much more sophisticated look.