The answer, provided by the show, is that Bernadette gets her clothes from Forever 21, while Amy’s clothing is from Forever 63.
(with subtitles, for our Spanish-speaking amigos)
“Forever 21” is a real clothing line. Penny was joking when she said that Amy got her clothes from “Forever 63,” although there was another time when Amy said that she wore a lot of things she inherited from her grandmother.
This. I’m actually a smallish-boobs-are-better man, but Rauch’s face (and shortness) make up for her oversized rack. Especially when she’s wearing glasses.
The great calves don’t hurt.
Penny is beautiful, stacked, funny, charming, and not brilliant; Bernadette is attractive, stacked, not quite as funny, not nearly as charming, and brilliant. So for me, it’s Penny.
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It does occur to me that, if fight were to break out, Penny would be a lot more useful than Bernadette. So while Bernadette’s still a good deal hotter, that does earn Penny a few extra points.
To disguise Bialik’s flattering curves. They prefer Amy to be unattractive. They sort of lapsed a bit in the episode where she was in a blue TOS starfleet uniform playing doctor with Sheldon. She had to wear a short skirt in that scene.