Totally random.  

Under DeVries, Drake wore alternate jerseys pretty frequently.  The greys, the Des Moines jerseys, the throwbacks, etc.

Have they done that yet this season?

Greys are no longer in rotation, other than that we typically only wore the DSM 1-2 times and the throwbacks 1-2 times per season

Glad the greys are no longer in rotation; never liked them.  I think they wore them more than any of the other alternate jerseys.

The Des Moines jerseys will be worn for the Feb. 8 Indiana State game.

We've seen via promotional material they have the throwbacks back but there has been no announcement or otherwise on when they will be worn. 

(Last year Adidas discontinued the jersey style the throwbacks were based on so they had to go back to the drawing board and redo them.)