You can't change companion weapons or armour

Is that a direct quote from the codex or stated in the dialog/ text of the games?  

Honestly though here is the thing:  I am just very uncomfortable acting like an elitist keyboard warrior and telling BioWare how they should be writing their own game.  That we know it better then they do.  This is the...height of arrogance.  Its bordering on pure silliness.  Its armchair quarterbacking pure and simple when the vast majority of us have A. never had a job in the game industry.  B. don't even understand the industry that well.  C. don't have a job at BioWare.  And D. despite it all I have not seen anything that explicitly says that Peebee can't just go around in a breath mask.  

Which brings me to point number 2 that is really bothering me about this 'armchair quaterbacking'.  Correct me if I am wrong but we have not actually seen Peebee wear a breath mask in a zero atmopshere environment.  And also correct me if I am wrong but I do not remember that happening in ME 2 or 3 either.  Maybe the Geth ship actually...either way though people just seem to be jumping to conclusions of: Bad BioWare, bad bad BioWare, naughty BioWare, look at how stupid they are, what tools they are, we have to spend all day having circular arguments because they can't put helmets on people!...when we do not even know, for one hundred percent sure, that someone would even need a helmet in the situations where we have seen Peebee running around in a breath mask. 

How does 'every race needs full suits to be protected' not contradict your point? 

One thing that really bugs me about this is how on one hand they ignore the lore about hazardous environments, yet on the other make every planet have a hazard.