To start with - the Obr43 Gymnastiorka pronounced with a hard 'G' incidentally.
According to http://www.rkka.ru http://www.rkka.ru/uniform/terms/gymnast_43.htm these are the regulations for the M43.
This tunic was introduced on 15th January (Prikaz No.25) and from the first pockets were only for officers. On 5th August 1944 enlisted female personnel were authorised to have pockets and on 6th September 1944 all enlisted personnel were permitted the type with pockets. Though you only have to look at the pictures to see that the norm right up to the end of the war for enlisted personnel was the pocketless type.
For many years the only game in town has been 1950s pocketed gymnastierki. However, now there are plenty of good reproduction bez karmanov (without pockets) ones available from the usual outlets.
However....
Repro (actually of an Obr35 but you see the same thing on the repro Obr43)....
Original....
Note the flared sides on the original, this makes the gymnastiorka a damned sight easier to get on and off and also means that you can put the regulation single pleat in the back which keeps KomStezh happy 
Finally, at the prices there's no point to farbing out on this one... 
Comrades,
Uniform Norms....
Within Red Army Norms for the Great Patriotic War there are two main periods, with additional subdivisions..
For the Uniform Norms.. (The bad men of the NKVD used similar Uniforms which had important differences in the cut of them, mostly in the pocket design and shapes)
35 Pattern Uniforms, with 35 pattern Coloured Insignia ( Collar tabs) and Ssh 36 Pattern Helmets, ( some use of Ssh 39 and Ssh 40 Pattern Helmets becoming available).... 1939 to early 1941.
35 Pattern Uniforms with 35 pattern subdued Insignia and Ssh 36 Pattern Helmets, ( from 41 onwards Ssh 39 and Ssh 40 Pattern Helmets increasingly becoming the Norm).... mid 1941 to mid 43.
43 Pattern Uniforms with 43 Pattern Insignia( Shoulder Boards) and Ssh 40 Pattern Helmets.( some minor use of earlier patterns in supporting arms of the Red Army to use up stockpiles) .mid 43 to 45 and into the late 1960's with minor Insignia changes in the Soviet era of the 1950's and 1960's, the Ssh 40 and Ssh 40M Helmets with Ssh 60 Helmets being used in these later periods
( Not wasting anything you can wear 35 Pattern Uniform with 43 Pattern Shoulder Boards to wear out stocks.. Images from Berloga ( Lair of the Beast-Berlin) still show them worn in 1945).
In a nut shell Border Battles early mid 1941..wear 1935 Pattern Uniform with subdued and some full Coloured insignia ( the Regulations of April 1941 changed from full colour to subdued).
Up to and including Stalingrad wear 1935 Pattern Uniform with subdued insignia.
Kursk onwards to Berlin 43 Pattern Uniform and Insignia.
1943 Pattern Uniforms in the Dress Regulations came as for Officers with Breast Pockets on the Jackets and Without Breast Pockets, for the Other Ranks( EM for you Amerikosy Comrades)... as the GPW progressed the use of Officer Jackets was allowed first for Women and the by late 1944 O/R (Comrade Sasha has supplied the dates of change overs in his Topic on 43 Dress regulations..) .
It is better for O/R to wear Pocket less Jackets or Gymnastiorka , the Historical Documentation show this...
In the Soviet Army era of the 1950's and 1960's the Pocketed Gymnastiorka became the Norm for all..
All Red Army Field Uniforms were of two weights, Summer ( Cotton) worn with a Pilotka side hat and Winter ( Woollen) with a Shapka-uskanka fur hat when Berlin was stormed the Red Army was still in its Winter Field Dress... A Spring and Autumn period may have had a modification on these Regulations as would the Commanding Officer of a Formation.
Of course within the Red Army supply problems effected this Norm... that is why we have The Special Department, to hunt down these Economic Wreckers and Counterrevolutionaries..
After 1969 we are into another set of Dress Regulations, largely leaving the GPW Patterns of Dress behind...... .
