This idea for Carol's Captain Marvel uniform comes from the Ultimate Captain Marvel idea mixed with Thor and the Warriors Three movie costumes. This could work for Carol's Captain Marvel movie costume. The Earth bound characters like Cap and Black Widow in the Avengers wear uniforms that look more like fabric and have straps and zippers and pouches. But Thor and Loki and the Warriors Three wear highly elaborate designed armor. Of coarse, like Thor, she would only have the helmet for a small scene and then never wear it again. Unless the actress is like Hugo Weaving or the actor who played Loki and she doesn't mind wearing the helmet.
I made the armor more rusty reddish (like how the Warrior's Three's armor were colorful) instead of silver like the Ultimate version. Her clothing under the armor would be like Thor's pants, fabric but still trying to look alien.
(When Mar-Vell is wearing the armor I imagine his skin would be glowing blue like Dr. Manhattan in the Watchmen movie.) So he would still have the red and blue color scheme from the 616 Captain Mar-Vell, and the glowy thing of Genis-Vell.
The idea would be that this is Kree (Mar-Vell's) armor that he gave her as he was dying. The Kree tech converted it to her body. Now she uses his alien armor and technology to protect, sort of like an extremely advanced Iron Man armor from space.
This version has what could be glowy areas on her armor.