how to fix added obj bulking out like this in the below pic

[Lord Tengen]

iam making matt hardy 22-AEW attire mod. so i took all obj including jackets, bottoms 

all objects worked well.. but jacket was bulging out like this in the below pic. matt hardy is wearing a sleevless one.. so i masked half of the hands of jeffs jacket and imported to newly made EMD pac of matthardy. but in game all worked well but jackets remains same. the masking what i done for jackets has not worked well. so how can i fix it. even in head obj too there r some issues. so pls someone help me to fix this issue! im sure its not muscles file issue

pls help.. thank u