IvyRobesMens Tab-Collar Long Sleeves Clergy Shirt- 5 Colors Available

Does the shirt come with the white tab or do I need to buy it separately?

Is this an Anglican style or Roman style shirt?

What is the sleeve length for a 15" collar?

Normal 16 1/2 is 34/35 length. the size chart doesn't make sense. 16 1/2 by 25 1/2? . what does this mean?