Call her and figure it out

"Daniel it is early morning 6:30 am, how did you manage to buy a suit for me?" Rachel was surprised, she also wanted to ask how did he know her size but she was too embarrassed to ask that.

"Last night after our game of chess, I called a friend of mine who owns a designer boutique. I asked him to get a suit delivered for you by early morning today, they are working for some upcoming fashion week and were all awake so he sent one from his boutique an hour back. Today before sending the suit he asked me for the size and since you were sleeping, I checked your clothes that were kept to dry in my washroom, I checked your size and ordered it accordingly, sorry for checking your clothes." Daniel explained everything in detail as he knew what she must be wondering and also he did not want to look like a creep.

Rachel didn't feel embarrassed about him checking her clothes because only her shirt and pants were kept to dry, her undies weren't, so she was fine with it.