A good way to wear your summer brights and neons into the fall is to pair them with a darker colour, either a neutral or a paler shade of the same colour as the statement piece.
You could pair this neon pink blouse from Style Says Shop with these khaki green cargo pants from H&M. I also love this look because the trousers give the outfit an edgier, more masculine feel while the blouse makes it feel more feminine. Alternatively, pair the blouse with pale pink trousers, like these from Gap. The cords also give the outfit more of a fall feel. Throw a black blazer on top of either outfit to complete the look.
You probably don’t want to do floral or lace, since it might look too contrasted with the nylons, so a black or beige in a light summer material would be perfect. Even denim looks great with this look, including short overalls, like these ones from House of Fraser.