All of this is clearly a fiasco for MLB, as well as Nike and Fanatics. The blame game has been mostly focused on Fanatics, whose apparel quality has been maligned by fans for years, but the real fault might rest on Nike. As Uni Watch notes, Fanatics has been making MLB's uniforms for four years out of the same factory in Pennsylvania that Majestic used when it was the league's manufacturer.
What has changed is Nike has introduced what it calls the Nike Vapor Premier jersey, which uses a material a news release extolled as breathable, lightweight, high-performance fabric with 25% more stretching and which is almost assuredly cheaper to make. Nike has also moved the MLB logo from the collar to just below it, causing the smaller letters on the tops that fans didn't like.
https://sports.yahoo.com/mlbs-fanatics-produced-pants-blasted-by-players-union-chief-pants-are-see-through-002616265.html
Of course, MLB commissioner and all-around douchebag Rob Manfred
defends them (at the link above) saying
"After people wear them a little bit, they're going to be really popular."
On edit: What pisses me off the most: MLB, FANATICS & NIKE DIDN'T DISASTER TEST THIS FIRST WITH THEIR PLAYERS???