I would transition it into an adventure for us like this;
When you are in clothing store, ask the target to try on the item picked out as a gift suggestion. When they come out with it on say it looks good but shouldn't what ever else she is wearing doesnt go with it, Pick out other items and have her try it on. Then when she comes out of dressing room say "Wow that outfit should totally thank you for wearing it. I bet the designers had you in mind when they created it."
If you are in a clothing store that also has guy cloths, say "Now lets pretend you are on a date with a guy and you are wearing that outfit. What outfit could a guy get here to compliment that?
Next thing you know you guys are playing dress up, Stop put your arm around her and pose in front of the mirror. Take her hand and spin her.
Then if you just want the number, pretend you just got a text from a buddy and say you totally forgot you were supposed to be somewhere. Thanks for the fun. Whats your number so we can do this again sometime!