This is a list of all known movies starring Alexei, Romanov and Rasputin. Maybe the most filmed sailor suit topic about a single boy in sailor suits (and uniforms). Tsar Alexei is shown at different age, sometimes there are other boys and girls as well in sailor suits. And sometimes white and blue sailor suits. More infos and some more pics at their entries. If I missed one, please comment. Christian Bale is one of my favourites (Anastasia: The Mystery of Anna). Note that there are many more documentaries with original b/w or colorized footage but I only list feature films starring other actors here in sailor suits. Rasputine (2011) had recently been aired, but I missed the sailor suit scenes, so I take one from the official trailer. Note that I don’t know all movies completely.
The Fall of the Romanoffs (1917) Lost silent film, Lawrence Johnson as Alexei (unknown if sailor suit)
Into Her Kingdom (1926) Silent film, Byron Sage as Alexei (confirmed boy in sailor suit), rating ~3
Rasputin and the Empress (1932), rating 5
La tragédie impériale (1938), aka Rasputin (1938), rating 4+, Jean Claudio as Alexei
J’ai tué Raspoutine (1967) rating 5, boys+ girls
Nicholas and Alexandra (1971), rating 6
Fall of Eagles – s1e11 (1974) rating 3
Anastasia: The Mystery of Anna (1986), rating 7
Tsareubiytsa. Aka The Assassin of the Tsar (1991),
rating 7-8. Aleksei Logunov (although on the cover, I haven’t found any sailor suit scenes)
Kon belyy (1993) rating 2
Rasputin (1996), rating 6
Romanovy: Ventsenosnaya semya (2000), rating 7
The Romanovs’ Last Photograph (2007) short film, Jessica Sportelli as Alexei
Raspoutine (2011) starring Gérard Depardieu (rating 3, very young Alexei)
The Tsarevich (2013) short film, Michael Fitzgerald as Alexei rating 4
Raspoutine (2016, was 2013) / original title: Rasputin : The Healer (announced in 2011), still unreleased in 12/2017, France, starring Jean Reno as Rasputin, director Rose Bosch, project paused
The Young Rasputin (2018, was 2016) USA. Mikhail Tank as Rasputin. Not released yet.
(Tsarevich Aleksei (1996) /1997, director Vitaly Melnikov, Alexei: Aleksei Zuyev. This is an earlier 1700s Tsar. A young boy in uniform, a woman in sailor-like collar.)
Still to check: Rasputin: The Mad Monk (1966) starring Christopher Lee, Robert Duncan as Alexei (unknown if sailor suit, probably not).
BBC Play of the Month: episode Rasputin (1971) with Jonathan Moore
The Successor 1996. Yaroslav Primachenko