T shirts which fit weight gain frustration

[yogafoodtravel]

I've put on about 1/4 of a stone and now all my summer t shirts and tops feel tight under the arm pits. Feeling frustrated as I purchased lots of new ones in the end of summer sales and they fitted perfectly.

The gain is in part muscle mass according to a recent health check. Possibly from more running.

Just feeling frustrated as the tops feel a little tight now and don't look as nice

Sell them & move on.

Your increased muscle mass will help you as you age & is more valuable than skinny arms.

Muscles & bone density win every time.

A) how does running build upper body muscles enough to make you outgrow clothes? Running usually leans you out

b) how does 3lb make your t-shirts so tight?