Crossword puzzle clue "size standard on what's my line"

Size standard on "What's My Line?"

Standard size packing unit loaded onto ships etc

Standard-size garb

Standard envelope size

Like a size 8 blouse vis-à-vis a size 10

Add vertical line 13 (word 3) and vertical line 3 (word 1) together and enter the answer to the resulting clue on this line

Add vertical line 9 (word 2) and vertical line 7 (word 2) and enter the answer to the resulting clue on this line

Add vertical line 1 (word 1) and vertical line 15 (word 3) and enter the answer to the resulting clue on this line