His uniform looked pretty plain and unimpressive unlike his father's.
I seem to recall (from some years ago) that this attire was referred to as the "Uniform of the Nobility," or words to that effect. Apparently a somewhat multi-purpose outfit. Regards, AP.
I remember reading that prior to the wedding, there was some anxious discussion over what he would wear, since he was not a military man and thus had no military uniform.
It's a lovely photo, in terms of the physical attributes and beautiful clothing of the bridal couple, but Felix Yusupov, quite frankly, makes my skin crawl.