The clasp is a two part clip.
The top piece is attached to the bra at the top of the cup.
The bottom piece is attached to the top of the cup which flips down. T
hese easy open plastic clips can be used one handed.
These are also called nursing bra clips, maternity bra clasps, or maternity bra clips.
Available in White, Black and Clear Plastic.
maternity bra clasps