I have this problem as well. I have had success with the petite tanks from the Karen Scott brand at Macy's. Perfect under a blazer. Not too much under-arm or bra showing if you chose to wear alone. The white is opaque and all the tanks have a nice thickness, but are not too hot in the summer.
https://www.macys.com/shop/pro.....ITE_SIZE_T|DEPARTMENT_TYPE!!8P%2C%20PM|Tops
They make a nice background for pretty necklaces, and can also
be worn under a cardigan. I buy the petite cardigans from New York and company (size up). They don't have the long sleeves one out yet, so no link. Loft/Ann Taylor cropped cardigans also work well for me. Theirs do tend to pill, though.
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