From Parisian filmmaker Francois Ozon comes an evocative, odd-length film of considerable panache. In A Summer Dress, a 15-minute appetizer that precedes Sea, a young man on a beach holiday moves with unconflicted French ease between his boyfriend and a sexy young woman — another Ozon stranger — happy to shrug out of her frock when the fancy strikes. No muss, no fuss. A Summer Dress: B