This photo also comes to us from tian79:
It's a regimental jacket belonging to Olga Nikolaevna. I think it's part of her Hussars uniform. They wore white dress cloaks over their uniforms, so perhaps this coat was a variation of that garment?
Just found Sarushka’s thread about OTMA uniforms : great idea!
Here are a few things I might add regarding photos of Olga’s uniform.
The blue dolman/tunic (« doloman »), white pelisse (« mentik ») and busby shown on photos posted by tian79 did not belong to Olga but are indeed from her regiment. As she held the honorary rank of senior officer she had hussar’s zigzag braid on her collar and wider one of her sleeves (see the color photo with the red skirt om page 1). Tian79’s blue dolman is a junior officer’s tunic. As for the busby and white cloak (« mentik ») they belonged to an enlisted man as the yellow cords show. An officer’s pelisse had gold braid instead and Olga’s would have had gold hussar’s braid on the sleeves too.
Olga received her uniform from her regiment on the same day she was named « Shef » (Colonel-in-Chief): July 11, 1909 (O.S.), her namesday. In his book about “Ol’giny gusary” (Olga’s Hussars), A. V. Voronov describes when she was named colonel-in-chief and how she received a delegation from her new regiment at Peterhof on that day. She was then presented with a full uniform kit (but without a pelisse) on behalf of the regiment. The uniform had been made by a “Court tailor” said a book published for the regiment. According to Empress Maria Feodorovna, Olga was extremely happy to receive this uniform.
Interesting facts about the pelisse : both Guards Hussar regiments had them but only a few Army Hussar regiments were granted one as a special priviledge. On November 3, 1911 a delegation from Olga’s regiment went to Livadia to congratulate their Chief for her 16th birthday (see photo on previous page of her standing between 2 officers) : on this occasion, her father awarded her regiment the rare honour of wearing a pelisse (mentik). Her regiment was given a white one with gold (for officers) or yellow braid (for lower ranks). Pelisses for the regiment were paid out of Olga’s own money (more than 20 000 rubles!) During Winter 1912, the regiment’s Commanding Officer went to Tsarskoe Selo to present a pelisse to Olga. On Parade Dress Order the pelisse was worn over the shoulders. Off ranks and in winter it could be worn as a jacket. My guess is that most photos showing Olga and Tatiana outside the AP alone, or side by side, were taken before Winter 1912 (Olga doesn’t have her pelisse and the girls wear no medals, as they do on photos taken in August 1913).
Their first horseback review of their regiments probably didn’t happen before August 1913 as the regiments had been invited to participate to the annual Guards Camp at Krasnoe Selo along with the other regiments which had Imperial Family members as Chiefs. The girls’ regiments first participated in the General Review held on July 25. Olga and Tatiana – wearing dresses, not uniforms – went along with the Emperor. Then, on July 31, a special review of the 3rd Elizavetgradsky H.I.H. Grand Duchess Olga Nikolaevna’s Hussar Regiment, the 8th Voznesensky H.I.H. Grand Duchess Tatiana Nikolaevna’s Lancer Regiment and 13th Leib-Grenadier Erivansky His Majesty’s Regiment was held for their Chiefs. This time all 4 girls went along, but none wore a uniform. But a special event had been planned for August 5 in Peterhof, « a day for Olga and Tatiana to remember » as their father wrote in his diary : another parade of Olga and Tatiana’s regiments, but this time the girls were to review their own regiment on horseback, in full-dress uniform. An interesting series of photos of these July-August days have been published by Marvin Lyons in his book « Nicholas II, the last Tsar ».
The joint regimental parade went well. Photos and film (which I have seen) were taken at the review. Here is a colored PC showing a proud Olga reviewing her regiment on August 5, 1913 (not in 1914 as caption says) :
After the parade, the officers and their wives were invited for lunch at the Grand Palace and group photos were taken outside (see page 1).