Your title is very misleading. You want Less trenchcoats, more chest armor for medium armor types.
Also, this belongs in the suggestions forum.
Also, this has been posted many times.
Recommendation: check out chest piece armor of the Krytan armor skin. This is an image of someone using it mixed with other armors (posted in the discussion thread, post your armor only if it is mix and match) https://dviw3bl0enbyw.cloudfront.net/uploads/forum_attachment/file/82325/Yumiko.jpg
