Fan lacing, so called because laces are fanned out to create a series of nested vees, is a very fancy way of actually simplifying the process of tightening your corset.
Corsets with Fan-Lacing – Lucy's Corsetry
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Corsets with Fan-Lacing – Lucy's Corsetry
Corsets with Fan-Lacing – Lucy's Corsetry
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Fan lacing corset, The Corset Wiki
How to Make Regency Period Fan Lacing - By Sidney Eileen