On Monday, April 3, 2017 at 9:57:21 PM UTC-5, OFWW wrote:
Sonny, this is slightly off topic, but it sounds like you would know
what I need to know.

I have an antique dining table from my Grandmother. It is higher than
normal Dining tables, but I do not know what happened to the chairs. I
know there were two chairs with arms, and at least six chairs for the
sides. It has a drop down ladder to support the table when fully
extended.

My question is this, in looking for chairs I am pretty sure I need to
look for upholstered chairs, but what height for the seat to the
floor? I currently have 17 1/2 inch and everyone sitting at the table
looks like little kids. IYKWIM.

I assume the difference in height is the cushions, as you made mention
for the Morris easy chairs.

Also a chair with a 24" arm height will fit under the table The table
top is 30" and under it is 29" from the floor.

Any advice would be appreciated. I am looking for chairs. I am not
sure if the table is mahogany or a dark Cherry.

Pretty much, the standard height of a dining table top is 30". Dining chair seats are 19" above the floor. Typical living room seating is about 17" above the floor.

I suppose for an average, and certainly for formal dining sets, the 2 end chairs are typically "captains" chairs, i.e., having arms. Side chairs would not have arms.

A formal dining seat may not be upholstered, but many/most are. For more formal dining chairs, the whole chair is often upholstered. These parameters vary, as it's what the person/family wants and/or fits their décor and function.

Hope this helps.
Sonny