Tartan

I like to use the #20 open toe foot. It gives me a good view of the fabric edge so that the buttonhole stitch is positioned correctly. As I get older, I find myself taking off my glasses and getting real close. Aren't aging eyes fun? :?

pab

another vote here for #20 foot. pab

candi

Yup, this is what I use too for appliqué and PP.

Cuilteanna

#20 or #34, depending what I'm doing. The #34 is clear but has the centre line marked which can be helpful.

Tink's Mom

I like the open toe embroidery foot. I think it is #20...but I'm not near the machine now.