"This is my new, black dress!"

[dmacg23]

I put "Ca c'est ma nouvelle robe noire".. that should be accepted!

[Sitesurf]

No it can't because what you wrote would be "that it is my new, black dress", which is not correct in English either.

The demonstrative notion is included in c'= ce (this/that/it)

[parlerhombre]

What's the difference between nouvelle and nouveau? (merci)

[racheltopf]

nouvelle is feminine and and nouveau is masculin

[ozzychris]

What's your thought on"Celui ma nouvelle robe noire"

[Sitesurf]

No, it does not work, notably because you have skipped the verb.

"this is" = "c'est" or "ceci est"

"celui" = the one