Everything we know about Anthem

To use a real world example (I know, heresy) … a pilot's helmet, externally it is identical to every other pilot's helmet for that platform, e.g. an F-35A pilot, wearing an HMCS helmet looks like any other F-35A pilot (except for "personalizations" like a visor cover) … And an F-16C blk 50 pilot, wearing a different type of HMCS look the same for the F-16C blk 50 platform … But cross platforms, helmets look very different (just as different classes of Javelins look different).

That said, the helmet and the jet don't care whether the pilot is male or female. The helmet itself is customized to the individual pilot. An interior lining in it is form-fitted to the pilot's head, covered by a liner, that shapes the interior of the hard shell helmet to that pilot. As long as that pilot is flying, unless the helmet is replaced, that helmet is only flown by that pilot.

I would guess something similar could be reasonably posited, for the Javelin suit. The exterior of the suit and its mechanics are fixed, but the interior is form-fitted to match the individual Freelancer. Unless the suit is destroyed or the Freelancer moves on, that suit is going to be worn only by that Freelancer.

So … a Freelancer that is highly talented, might even gain access to multiple Javelin suits, based on mission and team requirements. Each Javelin suit would be externally fixed (though some exterior, superficial customization might exist, kind of like a plane's nose art), but the interior would be form-fitted to that Freelancer.