is mencoba also used for try, for example food, or is it only as try on?
Yes. Saya mencoba makanan ini.
What is the word for gown? I thought these are interchangeable.
Gaun formal or gaun malam ... When talking about an evening dress; what we would call a gown; Indonesians would specify the type of dress.
Second sentence where I'm either missing 'am' or 'will'.