If it were me I'd just go for something real simple as the climate will really dictate what you can wear. Lightweight kinda sheer t-shirts either plain or some kinda print would be a good starting point. Same goes for shirts, something you can wear casually with a subtle print or interesting texture. Jeans I'd just rock plain black skinnies maybe grey and white occasionally if you've got the swagger. Footwear I'd go with vans/ converse maybe a pair of boots if the weather is tolerable.
And if you need a jacket then a denim jacket like you say you've got would be perfect, or a lightweight bomber like everyone on the forum is picking up atm.
Nailing the fit on everything will be key though especially the jeans and jackets, the denim jacket should fit snug allover and cropped. T shirts and shirts are a bit more generous as flowy/oversized tops are in right now and would be perfect for higher more humid temperatures.
Ill find some pics for inspo if you want.