"Pilots, Man Your Planes!"   
                                         WWII U.S. Naval Aviation Collector's Guide                                                                              
Summer Aviators' Gloves
The official description of these gloves is as follows:

"Aviation summer gloves are of a natural-colored, capeskin leather, unlined, pull-on type.
Authorized issue: Naval aviation pilots and flight crews.
Sizes: 7 1/2-11."

Although that's not a lot of information to go on, it's enough to get us started. Luckily, we have some original examples to study too that will fill in the blanks and show us what to look for if we want to add a pair of these to our collection. Unfortunately, as is often the case, mis-information has been previously published (in both books and magazines) with photos of what are purported to be original examples of WWII vintage gloves, but are, in fact, far from it.
As with many Naval Aviation items, there will be small variations among the authentic items you will run across which can be attributed to differing manufacturers or allowable interpretation of the item's specifications.
The most obvious thing to look for is the "U.S.N." markings. True WWII examples will have the letters inside a rectangular border,  separated by small squares, all rendered in a silver color. The three examples below are typical of what you can expect to find. The two on the left were never used and were still attached together at the cuff with thread. The pair on the right, on the other hand, appears to have spent considerable time in a cockpit gripping a stick and throttle. With use, the silver finish quickly wore off, leaving only a slight discoloration behind, but even when new, the silver markings are still extremely difficult to see in vintage black and white photos.
Each of our three variations can be seen in the vintage photos of Marine SBD pilots above, which are courtesy of vmsb243.com. 
Note below, when our gloved-hand images are converted to black and white and reduced in size, how difficult it becomes to distinguish the already somewhat faint silver "USN" markings.