for the backside of the fabric i just use a regular old mechanical pencil... cheap and readily available anywhere..
I have the fons and porter WHITE mechanical pencil.. I love it for darker fabs
I have a white one and grey Collins brand soapstone (pen style ones) i like ALOT..and it was less than $5 too.......
the markers ive never had good luck with.. it seems to be a one time use.. once opened it stops working the next day..
Nowadays there are soooooo many to choose from... I do hope you find one, two, or even three that work great for you..