Ruching and shirring are not the same thing. For starters, shirring involves elasticized threads in parallel rows.
Source: tatoeba (4512327)
Ruching
Synonyms for "ruching" (14 found)
Ranked by relevance and common usage.
Sample sentences
3 total sentences available.
Mantillas are larger than last year, and are generally all worn with a deep flouncing, either of the same material, or of black lace; the mantilla itself is also much trimmed with small ruchings of ribbon, guip and guipure lace, laid on quite flat.
Source: wiktionary
Probably for the first time since Lindsay Lohan was born, fashion designers, from the high-end likes of Miuccia Prada and Stella McCartney to mainstream classics like Jantzen, have taken a more refined approach to swimwear, emphasizing one-piece looks, halter tops, high-waist boy shorts and ruffles and ruching as camouflaging details.
Source: wiktionary