The 1974 program includes two photos of the Diplomats playing in what appear to be powder blue (carolina blue) jerseys with white trim. I am only familiar with solid navy blue jerseys (first picture below) or solid white jerseys being used during the first season.
The jerseys in question were made by Unbro, who maufactured the Dips uniforms their first three seasons, as evidenced by the company's trade mark triangle at the neck. The body is the lighter blue color, with the sleeves, collar and triangle at the neck in white. The logo patch used during the first season is on the left breast, and player numeral on the right. They lack the horizontal stripes the navy blue and white versions sported. If anyone has any informaton, or can provide other photos, please help me out.