A brief review of shorts fashions through the decades seems in order. No matter what decade, they all look cute to me!
1940s - Most commonly fitted around the waist and hips then loose around the legs. Simplicity 2017 has a rare elasticized waistline version as well. Note the high waist on Simplicity 3673.
1950s - Still fitted, and definitely slimmer around the legs.
1960s - Very slim and fitted! Proportioned for height was an important new feature.
1970s - Both fitted with the zipper moving to the front (a major shocking fashion move - a fly front zipper, just like menswear!) and loose with elasticized waistline (but still looking relatively fitted).
1980s - Elasticized waistlines are most common, and generally loose in the legs.