hello sw my dad wants to present something in fancy for my mom on her birthday he asked me which will be better

as per the deal to choose which is good i demanded some dresses for me too so i am posting here first for my mom ... he gave option to place order in online
which one is best
so i can come to one understanding
my mom is soo keen of thongs which she even preffered to wear in goa beach also
plz let me know asap