Does the flap of a butterfly’s wings in Brazil set off a tornado in Texas?

Edward N. Lorenz (1917-2008)

The Butterfly Shirt came about from working through the changes needed to be made for the Type 420 Tail Shirt to have no side seams. The sleeve seam is switched to the top of the sleeve so that it can run into the shoulder seam, therefore the cuff is inverted; the pockets are moved to the  front opening, therefore the placket and washing tab appear on the outside. Striped sleeve versions of this shirt refer to sleeved waistcoats, worn under frock coats, which often had striped, unlined, sleeves.