Kids' long-sleeve tiny hearts T-shirt

I bought the off-white shirt in medium. The shirt fits more like a large on my slender and tall girl. The design is super cute and, I love the metallic gold hearts sprinkled amongst the other blue, purple and pink hearts. My disappointment however, is with how THIN the fabric actually is, I can easily see my fingers through it. My child will be definitely wearing an undershirt with it. I'm wondering if the pink one would have the same issue.