Quite elaborate. Most shirts in the closet are fitted with sleeves, the ones I prefer to wear simply lack sleeves. If I don't use ‘em, I don’t buy 'em.
The thing is, I bought you this, the sleeves are on steroids, I once worked in Germany in the winter so I know how cold it can get in northern Europe
In Germany it certainly can get cold, but in the Netherlands the climate is pretty much dominated by the Northsea. Temperatures normally don't get below -5 °C (23 °F). It can get as low as -15 °C (5 °F ), but that seldomly happens. We invented heating and winter coats (with sleeves).