If the groom is a career soldier/regular, then there is no problem loaning a set from the camp.
But if he is an NSman/reservist, then it is most likely impossible to loan it from camp.
@rururoo: If your husband-to-be is an NSman/reservist, so it is not likely for him to loan the No. 1.
Also, perhaps you should ask if he wants to wear it at all, let alone wear it for a photoshoot. It's pretty inappropriate, unless it is a reminiscence themed shoot, retelling how long you've been together.