FYI Steve, the 2010-11 NFHS Football Official's Manual defines, and specifies, what uniforms are supposed to be worn for NFHS contests. A change, for this edition, expanded the option of wearing shorts to include a choice of white, or black, (previously white shorts were the ONLY approved option). If you read through the various descriptions, found on pages 7 and 8, you'll note the only described approved socks are (#3) one piece stockings wit a modified northwestern stripe...."
#8, which describes the type and color shorts that are an approved option, as authorized by, "By State Association adoption", so you might want to check with your State Association, who may have included a change in the socks to be worn authorizing "short, white socks" with their approval to wear shorts.
What the officials wear at either the NCAA and/or NFL levels are authorized by their respective governing organizations, rather than being responsive to personal popular fashion whims. That is why what is worn at each level is considered a "uniform".