Learn Turkish: Bu adayın giyinişini değerlendirmek istiyorum. - I want to evaluate this candidate's manner of dressing.

It starts with the verb giyinmek (to dress oneself). We drop the -mek and add the "manner" suffix -iş from this lesson to get giyiniş (way of dressing). After that, it gets a possessive suffix -i (his/her), a buffer letter -n-, and an accusative case suffix -i to show it is the direct object of the sentence.

Why are there two -i suffixes at the end of giyinişini?

The first -i is the possessive suffix, meaning "his/her" (referring to the candidate). The second -i is the accusative case marker, which is required because "the candidate's way of dressing" is the specific direct object being evaluated. The -n- in the middle is simply a buffer letter used to separate the two vowels.

Why does the word for candidate (aday) have the -ın suffix?

It is the genitive case, which shows possession, similar to adding an apostrophe-s in English. It links adayın (the candidate's) with the possessive suffix on giyinişi (his/her way of dressing) to build the complete compound phrase.

Why is the root verb giyin- instead of just giy-?