But I finally got the scarf done. It took me another week and a half to finish the picot edging detail. Here are the steps:
Join yarn using sl st.
1 sc into each st, turn.
1 sc, * 3 ch, sl st into third chain from hook, skip 1 st, 1 sc into next st, repeat from * to end.
(source: the cool girl’s guide to crochet)