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Description
This model I made is of me but as the opposite gender, and I wanted to dress him up as Dabi from My Hero Academia and I got the parts from importing the Dabi model into MMD and took parts. I managed to fit it on him, but some parts dont seem to fit well. As you can see the armpit is visible because of of something I probably did? I dont know how to fix it ... im not good at weighing models ;; its not only on that side of the model either, its also on the opposite side as well. It looks fine when he raises his arms up and down but if its towards another way , it starts showing skin. Also is there a way to fix the stretching of the pants near his crotch? I've experienced this before on another model, but i changed it because it didnt look right... Please help if you can QwQ

Description
This model I made is of me but as the opposite gender, and I wanted to dress him up as Dabi from My Hero Academia and I got the parts from importing the Dabi model into MMD and took parts. I managed to fit it on him, but some parts dont seem to fit well. As you can see the armpit is visible because of of something I probably did? I dont know how to fix it ... im not good at weighing models ;; its not only on that side of the model either, its also on the opposite side as well. It looks fine when he raises his arms up and down but if its towards another way , it starts showing skin. Also is there a way to fix the stretching of the pants near his crotch? I've experienced this before on another model, but i changed it because it didnt look right... Please help if you can QwQ