I must happily acknowledge the influence of ainhoa_v on this design. This layout copies their style quite explicitly, and they were very kind to give permission to use the background (a blend of 2 of their long beach shots with the people removed). 
 
https://www.instagram.com/ainhoa_v/ 
 
Once I had the background and the idea of silhouetted figures spread like a pattern, it was just a matter of finding the right vectors of people on Pixabay and coming up with a way to handle their reflections.
 
InterestPrint® Unisex Bucket Hat
Type: Chino Cotton Twill, All-Over Printing, Unisex Hat
 
8.82 Oz. Made from chino cotton twill fabric, soft and comfortable.
Designed for fashion women and men, stylish and personalized.
Size(approx)Brim:2.76"; Crown:6.69"; Side:3.15",Circumference:21.65"-22.05".
Upper running threads and four round-shaped threads for the special design.
Hand-washing.
Great for summer outdoor activities.
Designer Tip: To ensure the highest quality print, please note that this product's recommended upload image size in pixels (W x H):
Crown: 1100 x 1100 or Higher / 150 dpi;
Side 1: 1800 x 670 or Higher / 150 dpi;
Side 2: 1800 x 670 or Higher / 150 dpi;
Bongrace 1: 2230 x 920 or Higher / 150 dpi;
Bongrace 2: 2230 x 920 or Higher / 150 dpi.
 
InterestPrint says:
We can't guarantee exact placement. There might be slight discrepancies in print placement.
We allow the color accuracy deviation of the finished product and the mockup image to be within 5%.
There may be small differences in the design of clothing products, with a deviation of 2-3 cm measured manually during the production process.
It is impossible to perfectly align patterns or images from front to back for all over print products.