am str esses ▁are ▁provided ▁with ▁the ▁pattern , ▁with ▁the ▁intent ▁of ▁using ▁as ▁little ▁fabric ▁as ▁possible . ▁Pattern s ▁will ▁specify ▁whether ▁to ▁cut ▁on ▁the ▁gra in ▁or ▁the ▁bias ▁to ▁manipulate ▁fabric ▁stretch . ▁Special ▁pla cement ▁may ▁be ▁required ▁for ▁direction al , ▁strip ed , ▁or ▁pla id ▁fab rics . ▁ ▁Support ing ▁materials , ▁such ▁as ▁inter f acing , ▁inter lin ing , ▁or ▁l ining , ▁may ▁be ▁used ▁in ▁gar ment ▁construction , ▁to ▁give ▁the ▁fabric ▁a ▁more ▁rig id ▁or ▁dur able ▁shape . ▁ ▁Before ▁or ▁after ▁the ▁pattern ▁pieces ▁are ▁cut , ▁it ▁is ▁often ▁necessary ▁to ▁mark ▁the ▁pieces ▁to ▁provide ▁a ▁guide ▁during ▁the ▁se wing ▁process . ▁Mark ing ▁methods ▁may ▁include ▁using ▁pens , ▁p enc ils , ▁or ▁ch alk , ▁tail or ' s ▁tack s , ▁sni ps , ▁p ins , ▁or ▁thread ▁trac ing , ▁among ▁others . ▁ ▁In ▁addition ▁to ▁the ▁normal ▁lock st itch , ▁construction ▁st itch es ▁include ▁ed gest itch ing , ▁under st itch ing , ▁stay st itch ing ▁and ▁top st itch ing . ▁Se am ▁types ▁include ▁the ▁plain ▁se am , ▁z ig z ag ▁se am , ▁flat ▁fell ▁se am , ▁French ▁se am ▁and ▁many ▁others . ▁ ▁Cl othing ▁technology ▁Cl othing ▁technology ▁has ▁evol ved ▁to ▁a ▁complicated ▁science ▁we ighed ▁against ▁the ▁labor ▁cost ▁making ▁positive ▁and ▁negative ▁effects ▁across ▁the