She always looked fabulous, didn't she? I'm not a huge fan of sleeveless for Mass though. I like something to cover the shoulders at least a little.
She does have her shoulders covered, it's just that her dress is cream, so it sort of blends in with her skin, plus the chapel veil sort of covers it up so it makes it harder to see.
Dress should NOT be sleeveless at all! No excuses please!