How will that compare to the number who would buy the same product but with a  short  pant length?
( How ( ( ( will that ) ( compare ( to ( ( the number ) ( who ( would ( ( buy ( the ( same product ) ) ) ( but ( with ( a ( short ( pant length ) ) ) ) ) ) ) ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHADVP (WRB How)) (SQ (MD will) (NP (DT that)) (VP (VB compare) (PP (TO to) (NP (NP (DT the) (NN number)) (SBAR (WHNP (WP who)) (S (VP (MD would) (VP (VB buy) (NP (DT the) (JJ same) (NN product)) (PP (CC but) (PP (IN with) (NP (DT a) (JJ short) (NN pant) (NN length)))))))))))) (. ?)))
Don't even consider a comparison in consumer amount for same product with modification.
( ( ( Do n't ) ( even ( ( ( consider ( ( a comparison ) ( in ( consumer amount ) ) ) ) ( for ( same product ) ) ) ( with modification ) ) ) ) . )
(ROOT (S (VP (VB Do) (RB n't) (VP (ADVP (RB even)) (VB consider) (NP (NP (DT a) (NN comparison)) (PP (IN in) (NP (NN consumer) (NN amount)))) (PP (IN for) (NP (JJ same) (NN product))) (PP (IN with) (NP (NN modification))))) (. .)))