Detachable Collars

 One way of adding versatility to a garment would be by adding a detachable collar, so that the wearer could decide whether or not to wear the collar whilst wearing the cape.

A starched-stiff detachable wing collar from Luke Eyres.

"A detachable collar is a shirt collar separate from the shirt, fastened to it by studs. The collar is usually made of a different fabric from the shirt, in which case it is virtually always white, and, being unattached to the shirt, can then be specially starched to a hard cardboard-like consistency." (Wikipedia)

Here is a brief history of the detachable collar according to My Custom Tailor:

Mrs. Montague, tired of washing her husband´s shirts because only the collars were dirty decided one day to snip off a collar, wash it, and sew it back on. Mr. Montague, it´s written, agreed to the experiment, and in 1827, the first detachable collar was made at their home at 139 Third Street.

Using a detachable collar:

A pair of collar studs; the longer left one is the front stud

"The collar is attached to the shirt by a pair of studs like those shown. The shirt has a tunic collar, a short upright band of fabric with a hole at the back and one on each side at the front. The stiff collar is attached at the back before the shirt is put on (and the tie placed under the collar for a turndown collar), then the shirt is put on, after which the front stud is pushed through the collar to fasten it."

"To starch a collar, it must be rinsed in boiling water to remove any starch, then laundered as normal. After soaking in a concentrated warm starch solution, it is left until nearly dry, then ironed until hard. While ironing, the shape is added by curling, or using a collar press".(Wikipedia)