Pearls, spangles, laces, metallic thread, and embroidery, were all expensive in the Early Modern period (and still even today), and so decoration of clothing tended to be the preserve of the rich. While labour during the period was cheap, the materials needed were expensive, especially in the quantity needed to decorate sets of clothes. You can see the quantity of pearls and gold trim in the portrait below, all of which would have been incredibly expensive, and (naturally) beyond the reach of most of the middle classes.
Likewise in the below portrait, while the time and labour involved in the vast quantity of embroidery would have been relatively cheap, the gold and silk threads would have been hugely expensive: unlike the plastic gold threads we have access to today, 16th Century gold thread generally consisted of gold (as in the metal) or silver gilt strips wrapped around a silk core.
However, a breakthrough in the late 15th and early 16th Centuries enabled far more people to decorate their clothes.
The origins of slashing and pinking are unknown, but there are various theories. Soldiers returning from the battlefield with slashed, torn clothes are possibly the origin of the fashion for making pointless cuts and holes in fabric. Other stories involve the Swiss army beating Charles the Bold, Duke of Burgandy, in 1476, stealing the clothes amongst his possessions, and patching the luxurious fabric onto their own in repairs, or (more mundanely) that soldiers cut slashes into their leather tunics to give more ease and manoeuvrability. Whatever the precise origin, it appears to have had military roots.
The thing that helped the trend to spread like wildfire, however, was its simplicity. It didn’t require any extra items to be bought for embellishment: it was embellishment in and of itself. It took nothing but time, and some very simple tools.
Tailors used scissors anyway, and these could be used for large slashes, or to cut the fabric into strips. For smaller cuts, or more subtle designs, a chisel like tool, a hammer, and a block of wood covered in lead were used to make patterns. These slashes and holes in garments could then show another fabric beneath: just the lining, or (if you had more money) another, expensive fabric.
The fact that the chisels could be used over and over, create countless designs, and took only labour without requiring extra materials rendered this ever popular decorative technique available to the middling classes who had a little money to spend on fashion, not just practical clothes.
Above, you can see slashing on the clothes of some English ladies, a boy from Sienna, and a German lady. For the majority of middle class people who wanted to show off their money through their clothes, slashing and pinking were the way to go, along with applied cloth strips to serve as guards on the hems of skirts, since they served the triple purpose of being decorative, replaceable, and prolonging the life of the skirt.
The majority of fashionable trends in the 16th century were localised, and relatively short lived. Pleated clothing, in Germany and the surrounding area, for example, never spread very far, and with the homogenisation of European fashion in the 18th Century, it died away.
Slashing and pinking, however, continued in popularity all the way through the Early Modern period and into the 19th Century, with women complaining in the 18th Century of careless men letting their swords catch on their dresses in the street, resulting in the tearing of their silk gown. It changed very little in essence and technique, though from the 18th Century onwards, circular holes made in fabrics as well as scalloped edges were far more common.
Despite these changes, slashing in its original form made a comeback in the Regency period on some dresses! While the 1790s-1820s are known for their neoclassical fashions, some dresses were also made to emulate the renaissance period, mixing the high Italian waistlines with slashed sleeve puffs and ruffly chemisettes.