spectreconfessions:

“I’m curious to why Jack is the only ME2 squad member that has a new appearance.”

I like to think it’s a sign of character development and growth, that while she’s still a rebel at heart, Jack’s also learned to accept some rules, structure, and order in her life. Additionally, her ME2 attire was her Purgatory prison outfit, which, honestly, I wouldn’t want to still be wearing a year down the line myself. And working in a school-ish setting like Grissom Academy probably does call for a more modest form of dress than her ‘clothes’ in 2, which this would more or less count as.

And then there was the plan for her being a squadmate for some period of time (you can see the places for weapons slots on the back of her jacket), so that probably played a part as well.