My mother-in-law wants me to cover up my tattoos in my wedding dress

My fiancé and I are getting married in November. I’ve been looking at wedding dresses to figure out what I want, and so far I know that I want to dress with no sleeves. However I do have two tattoos; one on my wrist and one on my upper forearm. My fiancé’s mom wants me to wear a dress with long sleeves so that they’re covered up. His dad doesn’t really care and my parents don’t care either but it’s only his mom with a concern. What should I do?