The corset busk is optional as you can have a corset pattern with lacing at both the front and back, there are even corset patterns with closed fronts. However the majority of corsets are designed to open at the front with a busk.

What does a busk do in a corset?

A busk (also spelled busque) is a rigid element of a corset at the centre front of the garment. Two types exist, one- and two-part busks. Single-piece busks were used in "stays" and bodices from the sixteenth to early nineteenth centuries and were intended to keep the front of the corset or bodice straight and upright.

What can I use instead of a busk?

Front-opening options

You can go with a traditional busk, a spoon busk, hook and eye tape like found on many lingerie corsets, swing-clasp busks which have a great steampunk look, or even a zipper.