This is why you try things on before you buy them.
Also, if you're taking in BR sweaters, you should be spending money elsewhere.
Suggested steps for RTW shopping:
1 - find something you like
2 - try it on
3 - decide if it fits
if yes, proceed to step 5
if no, proceed to step 4
4 - put it back, return to step 1
5 - purchase and enjoy