 If you liked
Canis Series
|
 ...then you might like
Joou to Shitateya
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In both the manga, there's a mature man who works professionally in the fashion industry (clothes/hats), has considerable experience and has made a name for himself in the said field. One day, a very young MC is exposed to a world he didn't know existed, and he immediately becomes fascinated with it. It's also this MC who realizes his feelings for the mature man first.