Balenciaga could suffer a major financial hit — and lasting damage to its coveted brand — after the pricey luxury label ran an ad campaign with children holding teddy bears wearing sexual bondage gear, industry experts told The Post. The flap unfolded last week when the Spanish fashion brand apologized for the revolting campaign. It pulled the ads and later filed a lawsuit against the producers, blaming them for the inappropriate imagery. But Balenciaga — owned by the French luxury giant Kering, which also owns Gucci, Yves Saint Laurent and Bottega Veneta — will likely take a hit to its…