MeMoiBack Seam Thigh Highs | Flirty Thigh High Stockings

Do these have the silicone hold ups or will she need a garter belt?

Are these sheer or opaque?

I am 5ft 9 145 lbs. I like my stockings to be at least 34 to 35 inches from bottom of heel to top of stocking. How long are these?

Can 180 pound man wear them