I don't find it the most supportive. Lace bras usually have less structure, unless they are lace with a lining inside. Lace bras usually don't bother me, unless they are made from a particularly scratchy lace, but lace panties can chaffe if I wear them all day and do a lot of walking. The other day I wore some lace boyshorts and my inner thighs are still a bit red

I haven't found it all that supportive (allows for too much movement for my liking - especially if ya larger. The lace gives too much!
Plus it irritates me.

I don't believe it's the most supportive, but I don't really need it to be since I'm an A cup. I don't find it itchy unless it's really cheap stuff then it is uncomfortable. I love lace though, more than have of my lingerie is lace. It just makes me feel really feminine and pretty.

I don't find the lace to be itchy, at least not as itchy as mesh can be. I think a lot of that is in the quality, and how long it is meant to be worn--is it an undergarment for show/playtime, or made to be worn all day? That usually indicates how long it will be comfortable to wear, in my experience.