$433.10

[Achebe]

I hold your gaze firm
as a handshake and say 'how may I help,' nice simile gaze / handshake

but I'm not asking.
You can choose only the me you want to see—   Shades of Aqua. I'd prefer - 'choose the me you want to see', or 'choose the me you want' (avoids me / see), dropping the 'only'

soft spoken, hands in pockets,  'soft spoken' is prosaic
or joking and slapping thighs.

You can choose my voice: your daughter, your sister, ....'choose' yet again? 'your' can be deleted
your best friend forever. can delete 'your' and replace with 'or'

That's my favorite shirt!
Modal has effortless weight. It requires don't know what 'Modal' is, unless you mean 'voice modal', in which case I don't get the literal meaning, but what you're trying to say is clear enough.

a different bra, though. May I ask your name?
I'll go get my measuring

tape because I'm not really asking.
I notice

the pants you're wearing—
their stitching, leg shape, drape—

to make you wonder
if everyone sees you in this much detail.

You become self-conscious, wanting to please. 
Make me proud!

Buy the name brand jeans with the rhinestones on the ass.
They offer control on the inside.

Do you need new panties? Something lacy!
Men will be watching, and you don't want to be embarrassed

to reveal something ugly.
I'm sure your husband

would love the matching bustier.
You don't have a husband? Buy the bustier!

Four hundred thirty-three dollars, ten cents—
it's refreshing to lose the pretense.

You ask for my name with a grateful smile
and this is my final lie.

Hi Lizziep - nice job. But I while I think it reads nicely as a monologue and would be great read aloud, the lines are not particularly memorable.
Of course, not every poem has to do that. Sometimes it's okay to write a piece for the moment.
Another problem is that the speaker comes across as quite one dimensional and uninteresting. 
Finally, the couplet form looks arbitrary to me. Eg. 'your husband / would love'