so fashion

Perhaps a calque of Cantonese 噉樣／噉样 (gam2 joeng6-2, “like this; so”, literally “such + appearance”).

so fashion (not comparable)

1. (Chinese Pidgin English) in this way; like this; so; thus
   • 1849, Samuel Wells Williams, The Middle Kingdom

     “So fashion, eh?” rejoined my friend; “how muchee plice can catchee one alla same same for that?”

   • 1875, James Fowler Rusling, Across America; or, The Great West and the Pacific Coast

     Lookee sharp—so fashion—alla same mi

   • 1944, Robert A. Hall, Jr., Chinese Pidgin English Grammar and Texts, in Journal of the American Oriental Society, Vol. 64, No. 3

     Certain adverbs may take the suffix of manner fæšən, which does not change their meaning: sṓfæšən ‘thusly,’ […]

• how fashion
• what fashion