a person who makes or repairs sails.

What do you call a sailmaker?

sailmaker - a maker of sails. maker, shaper - a person who makes things.

Why is it called a sail loft?

All ports and fishing villages had sailmakers who were a key part of the industry in keeping boats and ships afloat. They worked hard to make sails in long spacious buildings called sail lofts. The length of the building was important to allow the sails to be laid out.