Blame Tina Knowles.
If you didn't already know, Tina Knowles was Destiny's Child's stylist for most of their career. Tina is Beyonce's mom. Tina is to blame.
The time they wore various white pieces of clothing and Beyonce wore a beret
Source: Getty
The time they wore American flag bellbottoms
Source: Getty
A closeup showing the detail put into the bellbottoms.
Source: Getty