Curious.
Yes, I didn't spot that the plain breast pockets had been omitted from the ice cream jackets.
Maybe they were a new batch made specifically for this trip and the tailor forgot them?!
I still think the RN are acutely aware that the old Roger Moore-style short-sleeve white safari suit looks fine, erm, on safari, but doesn't really cut it at a formal event next to the USN dress white chokers -- hence the continued inclusion of the long-sleeve ice cream jackets in the regs!
What they actually say is:
Notes
2. White tunic may be worn by Officers of Flag rank and certain members of staff, Commodores, Captains, Commanders in command, certain members of Flag Officers' staffs, Executive Officers of major warships, Attaches, Advisors, British Naval Staff overseas and Officers in certain exchange appointments. Also by other Officers, Warrant Officers and Senior Ratings when required to conform with accepted international standards of dress on state or major ceremonial occasions as directed by the State Ceremonial Training Officer at HMS COLLINGWOOD. 
As to the shoulder boards it doesn't really make much sense but perhaps they couldn't find them on day one or had a new set run-up overnight?!
Who knows...
Look at the difference too between the Commander's "court-mounted" medals and 1SL's "swing-mounted" medals; in fact, all of his decorations and insignia rather look like they were simply thrown at the front of his jacket with a blob of glue on them and have just stuck wherever they landed! At least the pockets gave them something to which they could align the bling! On that note, I've often wondered how our US cousins cope with the idea of an Admiral who has "only" four medals plus the weird chest and neck thingy (!)...?
Oh, and for SFMRAS, the RN Commodore rank still maintains the broad lace cuff ring with the separate loop above (in place of the curl on a standard lace ring) as the standard marking of rank (and the same is worn on working dress shoulder slides and hard shoulder boards). The authorisation to use the "single-star" ceremonial boards did not come at the same time as the increase in the number of stars on the ceremonial boards for Adm / V-Adm / R. Adm. If I recall correctly, there was a delay of several years before the *old* R. Adm one-star boards officially appeared in the regs for Commodores.
