Hi
I had a brief encounter with Marvelous Designer 6.5 back then.
First thing: ask them, wether you are allowed to use the Personal Edt or not.
Just to be safe. And maybe try the 30-day Demo. It is (was) a demanding application in regards to computer power.
It is a very specialized software application. For occasional usage it might be overkill.
If you need clothing for character a often it surely is a good choice I`d say.
To get convincing results you have to put some effort in - not unlike any other program.
There was no need for a T-Pose. The clothing pattern could be simulated on any mesh, as far as I remember.
It took also Daz3D characters if you use that. There was even a preset setting for import and export.
OBJ, FBX, Alembic and other common file formats could be im- and exported.
Also point caches in and out of MD. It was possible to simulate on animated meshes as well.
MD behaves like any other simulation software I think.
The more polygons aka mesh detail you have to simulate the clothing upon the longer it takes to get good results.
My impression was then that a lot of artists use MD to get a good simulated basic mesh of cloths which were then
brought into another application (mostly ZBrush it seemed) to do further detailing.
But I do not know how far MD has evolved. It is version 9 by now after all.
It was fun to use but I did not have enough use for it.
On the other hand with all subscription models in licensing today - if you can afford try for 1 year and see if it is worth the investment.
My2cents.
CHeers, Klaus
ps: I forget:
https://gumroad.com/madinaHer tutorial about the simple jacket "Making a jacket from scratch" was what I watched back then. It is a nice introduction.