Pilot frixion pens have been my go to fabric marker for a few years now. They have a 0.7mm rollerball nib and the blue ink is erasable - either by
Pilot Kese Lamé FriXion Pen Winter Edition - 0.7 mm - Lamé Silver — Stationery Pal
The Pilot FriXion Clicker Erasable Gel Pens come in the colors Black, Blue, Purple, Burgundy & Pink. The pen writes smooth & erases clean, so you can
Pilot FriXion Clicker Erasable Gel Pens in Assorted Colors - Fine Point - Pack of 5
Pilot FriXion Ball Erasable Gel Ink Pen 2pk
Pilot FriXion Ball Clicker Erasable Gel Pens, Fine Point, Assorted Ink, 7/Pack (31472), Staples
Pilot FriXion Ball Erasable Gel Pens, Fine Point, Assorted Ink, 3/Pack (31557)
Review: Pilot FriXion Erasable Gel Ink Pen — The Pen Addict
Pilot Frixion Heat Erasable Pen– Mindful Mantra Embroidery
Pilot Frixion Ball Clicker Gel Pen
Blue Frixion Ball Erasable Gel Pen, Pilot #FX7-BLU