So I am thinking of getting my sister (MOH) and my future step-daughter (BMd) this for a thank you gift to wear at the wedding (my FI and I also have something for both of them).

The wedding is water themed and they're wearing shades of blue. Thinking I'll look for something similar but smaller for family thank you gifts (1 sister is doing a reading, another taking care of the guest book, gifts, etc w/her daughters).
Thoughts?