Hanging Shirts
Actually there are two schools of thought:
Some say by the shoulders only, others via the shirt tails (clothes pins at the two side seams).
Several of my vintage laundry and housekeeping manuals favour the later, though give the former as well.
The idea behind hanging shirts via their tails is because it is easier to smooth them out, thus the wind will help remove many wrinkles. Also with the double fabric parts (cuffs, collars, and yoke), hanging in the breeze, they will dry faster.
Personally find hanging shirts by their tails a better option for reasons listed above, and because any marks from the clothesline will be towards the bottom of the shirt, not across the yoke. Depending on if the shirt is to be ironed or not, and how much work one wishes to make of that project, it can make a difference. For instance many modern steam irons do not put out enough moisture to properly deal with clothesline marks and or laundry "creases". So unless one is going to sprinkle or otherwise dampen one's ironing, the results may not be as good.
L.