Does the open back work with a bra?

Not with a standard bra. Plan on adhesive cups, a low-back converter or going without. The square neck gives some front coverage but the back is fully exposed.

How does the satin hold up?

Satin of this type wrinkles easily and usually needs steaming before each wear. Hand wash cold or dry clean; a hot dryer can dull the sheen.

Abercrombie occasion dresses generally run true to size, and the petite and tall options fix length issues. Check the size chart against your bust and waist, since satin has little stretch.

Can it work for a wedding guest?

Yes, for evening and formal dress codes. The solid color and maxi length suit guest attire; skip it for black-tie where a gown is expected.

What occasions is it too dressy for?

It reads formal. It is a lot for daytime casual events, brunch or the office, where the open back and satin look out of place.

How does it compare with a slip dress?

It has more structure: a square neck, draped bodice and cut-out back rather than thin straps and a straight bias cut. The trade-off is less ease and more fuss over wrinkles.