Golf, tennis, swimming, riding, hiking, camping: there were Butterick patterns for most summer sports. A two-page layout in Delineator from July, 1926, gives an idea of what to wear and how to accessorize it.
Don’t forget some lively socks!
A necktie is also appropriate:
The presence of blazers on all ages is probably a British influence (Butterick sold patterns in England and other countries, not just the U.S.) or an exclusive “private school” signal.
Bathing suit 5204 has a higher waistline; the belt covers the seam where the “tights” are attached — and, although the other bathing suits were brand new in 1926, No. 5204 first appeared in 1924.**
** The range of pattern numbers on these two pages (Delineator, July 1926, pp. 34 & 35) show that many of these patterns were “standards” that had been in the catalog for several years. Numbers lower than 4988 pre-date 1924, and bathing suit 5204 first appeared in 1924. The riding habit dates to 1922. (Source: Commercial Pattern Archive at University of Rhode Island. These specific patterns aren’t in their collection, but the number sequence is very clear. )