Oh such an original title...
This is Alice outfit for after the war, when she helps rebuilding London and then, the Mass Relays after the Reaper Invasion (because yes, she was a part of the war).
She mainly takes care of lifting heavy things(since she's a biotic).
She also wears her gloves because on times she has to carry things with her hands and she doesn't want them hurt.
And yes, I am very aware I was lazy. So shush
Alice (c): Me
Mass Effect (c): Bioware