Blue dress trousers were worn in the field by various officer ranks... at times as they had nothing else.
In 1941, the use of "color" elements of the uniform is fully justified. Many military units engaged in combat rather unexpectedly for themselves, and the one who was in the rear suddenly found himself in a combat situation due to the swift attack of the enemy. But in 1943-45 the situation was completely different - and if suddenly there were not enough officer uniforms, the officers used soldiers 'uniforms without any problems, but with officers' insignia. The colored elements of the uniform in battle are a great chance to win in a very unpleasant lottery
Why draw extra attention to yourself
However - this is me joking. The figure will look great on the table!