As far as hemlines are concerned, it's safest to stick to a skirt or dress that hits either at the knee or just slightly above. When in doubt, slip into some opaque tights—nothing too boldly patterned, please.
In most religious environments, baring your shoulders is a big no-no. Same goes for cutouts, sheer fabrics, and ultra-tight silhouettes. A tailored, long-sleeved dress is a safe and on-trend (thanks, Kate Middleton!) choice for a christening or bar/bat mitzvah.
Pieces in tweed or bouclé were made for a daytime affair like this.
ASOS Midi V Neck Dress in Rainbow Boucle, $98.48, asos.com
Turn Up the Texture
Worn during the day or at night, elegant lace never looks wrong.
Diane von Furstenberg Zarita Lace Dress, $325, shopbop.com
While an embellished flat can look great, it's better to choose heels for a religious occasion. Peeptoes and slingbacks are fine, but we can't resist the timelessness of a pretty pump with some added interest.
Stick to dimunitive, pretty pieces of jewelry—you don't want noisy bangles and chains distracting the rest of the congregation, after all. Pearls, diamond studs, or a standout cocktail ring are perfect picks.