Villanova Coach Jay Wright -- I Beat UNC ... In A $4k Custom Suit!!!

What's smoother than Kris Jenkins' NCAA tourney winning shot? Jay Wright's semi-bespoke, $4,000 Italian suit ... that was so sharp, social media freaked out.

TMZ Sports spoke to the man behind Wright's suit, his tailor, Gabriel D'Annunzio ... who tells us Jay has impeccable tastes ... and takes pride in being on of the best dressed coaches.

"He appreciates the press and comments [about his style]. It's flattering."

And the best ain't cheap ... at D'Annunzio's shop, semi-bespoke suits (like Jay's) run between $3,500 and $4,500.

As for the suit that had everyone talking last night ... Gabriel says it's Super 150 wool (high quality, expensive), slim cut, 2-button, medium blue with light blue…