16th. A customised item.
17th. Something you wear when it's sunny.
These are two pairs of shorts I've customised in the past, but because it hasn't been sunny, I haven't worn them much this year. You can see the black shredded and studded pair worn here and the US flag ones here and here.
The "something you wear when it's sunny" that I've chosen is my new sunglasses. I've worn glasses for years now, but never got a pair of prescription sunglasses. Now I've got these (Gok Wan for Specsavers in case you were wondering) and I love them. Finally I don't have to choose between squinting in the sun or being shaded but everything being fuzzy!