Answer:
The participle: dressed
The word it modifies: the bride
Explanation:
A participle is a term for a non-finite verb form, which can have different functions within a sentence. As there are two types of participles: present participles (which end in -ing) and past participles (-ed, -d, -t, -en, or -n), "dressed" is a past participle. It acts as an adjective in this sentence, as it describes and provides certain information about the noun "bride."