Riccardo Tisci hit all his signatures in his first men’s pre-fall collection for Givenchy. He said he was inspired by sharks, marines and surfers in the night—because, as we all know, nothing is truly sexy without an element of danger. And so shark-tooth necklaces, denim skirts, and leather shorts are in abundance. But luckily for those of us lacking the guts (and calves) to stroll about town in opaque meggings, printed hoodies, leather jackets, and tone-on-tone suits can also be found. Tisci’s a man who knows his customer…