Ease up on yourself a little first, why doncha. Your shape is okay.
Stop hitting yourself, because you tend to hit other people when you do it--get me?
I have a couple of big bright bold print dresses from that era and no lie, I look RAD AS HELL in them, and I'm very close to your measurements! Just a little bigger actually. One is a sleeveless fitted dress with a big A-line skirt ending just above the knee. Very flattering, very twirly. The combination of a boatneck and wide skirt make a waist look very nipped in. The other's a stretchy knit sheath with long sleeves and a mandarin collar, just below knee length. Gives a very voluptuous look. I'm describing them because they're very different but authentically and distinctively 60s.
What they both have in common that helps them suit someone about our size is non-flimsy fabric; both are sturdy poly knit. Both also are KNOCK YOUR EYES OUT LOUD, with large motifs in a high-contrast combination of colors. If you're self-conscious about your shape, a firmer fabric that glosses over minor bumps and a big bright print that breaks up shadows and outlines are absolutely wonderful. If that's looking like a circus tent then hell, circus tents are some damn good-lookin' things. Rock it, be bright, and don't worry.