Can you use sandalia for flip-flop? http://static2.thcdn.com/productimg/0/600/600/86/10207986-1297790384-330000.jpg
Funnily enough, half the flip flops in the UK have that little Brazilian flag!
"Havaianas!!!! As legítimas!!!" - That is the brand and slogan of those flip-flops.
Here you call flip-flops "o(s) chinelo(s)". A(s) Sandália(s) is accepted as well.
"Chinelo" and "chinelo de dedo" are only for those flip-flops.
"Sandália" can be other kinds of footwear (but not shoes nor sneakers nor boots)
In this sentence it's hard to make it fit.
But yes. Very often we use the singular form referring to a pair. This is valid for "pants", "shoes", "sandals", "socks" and most pair of clothes.
- Onde está a minha sandália = Where are my sandals --- ok (can be seen as my pair of sandals)