I really like your designs. You have a really good feel for the character and colors you choose work nicely together.
I haven't done much in way of original mando designs myself. But i did come up with my interpertation of Kal Skirata.
I'm saving it till i get extra helmet to try it on.
Looking at your first drawing i would go with a jumpsuit. Your design would work better with a form fitting shirt, maybe thicker material and maybe a cargo style pants??
Experiment with different clothes matching your colors in your design. I say formfitting shirt because of your chest armor. Think about Zam Wessel form fitting outfit. The chest armor is not laying on a baggy top.
Theres no rule saying you have to wear a jumpsuit.
Keep up the great work Hydra.