Louis Gaste, 88, the French composer who wrote the song that was plagiarized as the hit "Feelings," died of cancer yesterday in Paris. He also wrote the song known as "How Much is that Doggy in the Window?" In 1956, he wrote "Pour Toi" with his wife, Line Renaud. The song went nowhere on the charts. But in 1975, when Morris Albert adapted it as "Feelings," it became a staple of lounge-style crooners, and Mr. Gaste eventually won $500,000 in suing the singer-composer.